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This is a pretty good submission overall, just a few things to note

In your rough perspective, keep in mind you need to have your horizontals parallel to your horizon, and you need to keep your vertical lines perfectly vertical, so on a 90deg angle to the horizontals for this exercise.

Rotated boxes - remember we want our gaps to be consistent and narrow between each box, and keep in mind with each row we move along we need to rotate them just a little more on our major axes, i can see some rows where you have them rotated just the same, with the box further out just being smaller than the last

This is a great start, however theres room for improvement with rotating your boxes in organic perspective, where most of your boxes have about the exact same amount of rotation applied - check the rotated box examples, and see how on the outermost rows we have one plane where the outermost are just barely showing to us, and in your box challenge try to work on showing similar boxes to that

Your boxes are p good overall. You already got your critique officially, so I'll try to mention some things that might help you out nevertheless:

You still have a bit of trouble with inner corners. I made this demo to show another method to approach drawing boxes. Instead of completing first the outline of the box, you draw the inner corner before, as it's shown, in the fourth step. This helped me in figuring out the inner corner issue and hopefully it helps to you too.

Lastly, your boxes and lines are p good already, so I'd start hatching one of the faces closest to the viewer, as well as adding lineweight to their silhouette.

I recommend looking into the advanced exercises already too, as the boxes are p good.

Hi there! First of all, wanna say that you can use ballpoints for all these lessons, if you choose not to go for the official critique. Fineliners are definitely better, but ballpoints do the job pretty nicely. So don't worry about the materials and use them on the meantime.

Lines

Starting with your lines, they're pretty confident and good, keep focusing on confidence like that, and you'll nail the accuracy. A thing I've noticed is that some of your lines have a bit of fraying on both ends, when starting a line, you should carefully place your pen on the start of each line, so only a maximum of 1 end can fray. Plan each stroke you make carefully.

Ellipses

Ellipses are p good too, though they have a bit of wobble. Remember that on ellipses just like with lines, you should prioritize confident strokes over accurate ones. Don't hesitate to sacrifice accuracy to get them as confident as you can.

On the funnels exercise, don't forget that the minor axis should cut the ellipses in 2 identical halves, it's pretty hard, but be sure you're keeping it in mind while drawing them.

Boxes

Boxes are looking pretty good in general, though they have some issues:

-First is that you're having some wobbly lines here. Just like in the ghosted lines and superimposed lines exercise, you should prioritize confidence over accuracy always.

-Second is that you're repeating some lines that were off, no matter how off a line is, keep going as if it had been correct.

-On rotated boxes, some of your boxes weren't actually rotating, careful with that, this mistake is explained here.

-You've also not kept corners between boxes close on the rotated boxes as well, don't forget to do it

-On organic perspective I recommend doing more overlaps. You can clarify after the overlaps by adding a confident, drawn with the shoulder superimposed line on the part of the silhouette of the boxes that overlap. Perspective on them has issues but you'll work on it on the box challenge, so don't worry about it!

Overall pretty good job!

Welcome, and a big congrats on the attitude regarding critique! Let's get to it!

The lines section is quite good, save for one point: you'll sometimes redo a line that comes out wrong. This is discouraged. If a line comes out wrong, simply spend more time ghosting the next one.

The ellipse section is really nice, too, though i notice that they'll occasionally have a bit of a bend to them. Remember that it's more important for our ellipses to be confident, and circular, than it is for them to be accurate. Also, in the funnels exercise, the degree of the ellipses should either remain consistent, or increase, as they move away from the center- never decrease.

Nice job on the box section, too. The automatic reinforcing issue (correcting an incorrect line) is a bit too much of one here, but we've already spoken of that, so i'll skip it. Though they're, for the most part, fairly well done, there is the occasional obvious mistake in your convergences in the rough perspective exercise. I'd recommend spending a little more time in the planning phase, here. The rotated boxes exercise looks fairly good, though the rotation is a little minimal. Also, the corner-most boxes are missing their back sides. Finally, though the chicken scratching makes my eyes bleed, the organic perspective is quite good- especially that last frame. Nice flow!

Good job on a solid submission. I'm happy to mark it as complete.

First of all, congratulations on finishing the 250 box challenge! It's really hard to do it, and you pushed through, while being patient and applying the line extension method to every box, and drawing big on the page, just drawing a few boxes per page as instructed, good job! I think your improvement over the challenge is clear too, both on your lines and in your convergences.

Only thing I can point out on your boxes is that, even though it has improved, you still have trouble with the inner corner, which is entirely normal. Most students still have trouble with it after the box challenge.

To improve it, a think that particularly helped me, is to change the order I drew boxes in, as done in this picture.

This works, because it helps you think about the relationship of lines between boxes. When 2 lines are very close together, they will have almost the same convergence, as you can see in this example.

A diagram that explains it more in depth is this one, give it a read from time to time until you understand it. It's hard, but it is worth and it will help to get your boxes to the next level.

Once you get the inner corner nailed down consistently, I recommend looking into the advanced exercises of the box challenge, so you can keep challenging yourself and improving.

Overall pretty good job!

Heyo! Let’s see~

The lines section is really well done. There’s a tiny dip in confidence when you reach the ghosted lines, but it’s taken care of by the time you reach the ghosted planes. Keep pushing in that direction!

Though a similar trend is seen in the ellipse section, they’re still, unfortunately, a little wobbly. Remember that what’s important is for them to be confident, not accurate. As for the other aspects of this section, you’ve done a nice job of keeping them round in the ellipses in planes exercise, and a nice job of keeping them straight in the funnels exercise- well done! (By the way, the requirement is one page of funnels, not two.)

The rough perspective exercise also sees a lot of improvement in terms of the convergences, but not as much in terms of line quality. You’ll also correct the occasional incorrect line, which you’ll remember is discouraged. To take their convergences to the next level, I’ll remind you that, because of the rules of perspective, the back faces of your boxes are similar in shape to the front faces, but smaller. So, for example, if the front face is a rectangle, the back face cannot be a square. If your points suggest that it is, simply plot some more points. Though the rotation is minimal, this is a solid attempt at the rotated boxes exercise. The organic perspective exercise, too, is nicely done, though I’d have loved to see some more overlaps.

Lines and ellipses are pretty good in general, good job! On the funnels exercise remember that the minor axis should cut the ellipses in 2 identical halves, don't forget to aim for it.

Boxes look pretty good in general. Don't forget not to repeat lines though. No matter how off a line is, don't repeat it, keep going as if it were correct.

On rough perspective you seem to have trouble at times mantaining height lines perpendicular to horizon and width lines parallel to horizon, I know it's hard but try to keep it always in mind on this exercise.

On organic perspective, you can add lineweight with superimposed lines, but only do it on the parts of the lines of the boxes that overlap, don't do it to complete lines.

Your boxes are looking good, one thing to watch out for is for boxes like 166, the nearer plane will appear thinner as explained here, so your lines are actually diverging instead of converging.

Overall you're looking good, you have nice solid boxes with pretty clean lines. I suggest drawing your boxes a bit bigger in the future when you practice just for more practice with control, but otherwise you're set.

Keep practicing those convergences in your warmups!

Lines are p confident in general, good job! I recommend making the dots smaller on the ghosted lines exercise, so it's more clear if you have hit your objective or not, and be more careful with the superimposed lines, they have a bit of fraying on both ends.

Ellipses are mostly confident and good overall, but they have a bit of wobble. Remember that on them as well you should prioritize smooth and confident ellipses over wobbly accurate ones. There are also some overlaps on your table of your ellipses. Ellipses should touch each other, but they shouldn't overlap, careful with that.

On boxes you're doing mostly a good job, though you seem to have some trouble on rough perspective to keep width lines parallel to the horizon line and height lines perpendicular to it, don't forget to aim for it.

You're also repeating some lines. No matter how off a line is, keep going as if it were correct.

On organic perspective, you can add lineweight to the parts of the silhouette of boxes that overlap with others with a superimposed line to clarify their relationship, it helps a lot.

Heyo! Let’s see...

Starting off, your lines look quite good. There’s a tiny bit of arcing to your ghosted lines, so be mindful of that. (The recommendation is, usually, to arc in the opposite direction.) Also, in the ghosted planes exercise, I’d recommend placing start/end points for the non-diagonal center lines.

The ellipse section is really good! Your ellipses are smooth, rounded, and actually quite accurate. The only issue I notice is in the funnels exercise, where the degrees of your ellipses will sometimes decrease as you move away from the center. You’ll remember that they should either remain consistent, or increase.

The box section continues your perfect streak, though there’s a couple of minor things. The first is that you shouldn’t correct an incorrect line. This, of course, refers to redoing it entirely, but also to extending a line that stops short. Try to live with your mistakes. Outside of that, and some tiny foreshortening issues in your organic perspective exercise (the foreshortening should be shallow, as per the instructions), this is a fairly solid section, and a fairly solid submission. Well done!