Nopan

I understand what you mean by seeing the lines wrong in the rough perspective exercise. If i remember correctly, using a ruler for the first rectangle was allowed, so that might help you. Other option is to try to compare it to multiple lines. While ghosting try to compare the horizontal ghosting direction to the horizon line and the top or bottom of the frame at the same time. And with the vertical lines you can try to compare to the sides or other boxes you have drawn.

As for funnels i'm not sure how to fix that other than just ghosting more. Try to angle the major axis correctly in your head, so perpendicular to the line you drew before. If it's hard for you to see it correctly then i think it just comes down to practice

I think generally the most consistent "mistake" in here is the lack of confidence. Your lines have a lot of wobble in them. I'd say you should try different speeds of drawing the line and ghosting. If you go too slowly your lines can wobble more, but if you go too fast your accuracy will be worse and you might curve the lines more, so try it yourself.

There's a little bit more wobble in the ghosted lines than in some of the super imposed lines. So keep in mind the reason you're ghosting the lines in the first place. You're trying to find the correct movement before committing to the line. I think your super imposed lines were more confident because you got used to the motion. So do the same with ghosting the lines.

Small compliment break here, i think you're very good at keeping your starting point clean. This is something i observed in both the super imposed lines as well as the ghosted lines exercises. Keep that patience to always carefully start your line from the correct spot

Another part where the lack of confidence seems to be visible is the ellipses in planes exercise. Some of the ellipses were deformed to fit the planes correctly, which shouldn't be your main objective. Always remember that accuracy is not the priority. It's the skill you're building up as you continue drawing. So make sure you practice accuracy confidently.

The funnels exercise went pretty well for you i think. While not perfect, you still managed to keep your ellipses aligned almost correctly the whole way. Some of them were off because the guide lines were also not symmetric.

With your rough perspective exercise i think you could have been more careful when placing the first planes. Any misplaced lines there could mess with the rest of the exercise if you're not careful, since for example the planes behind the boxes should have parallel edges with the first plane drawn

In the rotated boxes exercise you did well placing the boxes close each other. But i think you didn't foreshorten the boxes enough. That made it seem like the boxes rotating away from our point of view were stretching. Also you redrew some of your edges here, which relates back to the confidence thing.

For organic perspective i think i would mostly repeat myself with confidence and avoiding repeated lines. But one other tip, make the lines converge based on the original y. Try ghosting the line over and over with slight angle changes to see when it looks right. Especially with the 250 box challenge you'll need to do that to make better observations before drawing the box

In your super imposed lines exercise your start points were slightly off, but i was still clearly able to tell which side was the start. But try to be more precise with your start. After ghosting you should place your pen down precisely, and then continue. Same with the ghosted lines exercise

In the ghosted planes exercise i see your lines curve and wobble a bit at times, but not too consistently to be an issue. Just remind yourself to try to make straight and confident lines. Also you sometimes made extra lines next to your "correct" lines, which you should also avoid. Just draw the line and go with it, no matter how accurate it is

All of your ellipses looked pretty good, but there sometimes they looked like you lifted your pen during the process. Otherwise they looked pretty uniformly shaped with little distortion

In your funnels exercise your ellipses were not aligned correctly. They should have been symmetrically devided by the straight line. You did it well a few times still, but remember to pay more attention to the direction of your ellipses

In the rough perspective exercise your original rectangles were off. Since it's 1 point perspective, the sides of the rectangle facing the viewer should be parallel to the sides of the frame (if your horizon line is parallel to the bottom of the frame)

In your rotated boxes exercise i think you didn't foreshorten enough. This made the far corner boxes unable to converge with the right ratio to the other boxes. Remember that the planes facing the viewer should be shorter as they turn away.

Organic perspective you did pretty well, but remember to avoid going over your lines. You should move on from a mistake and correct yourself in the next attempt instead of trying to make the mistaken box look correct

Thanks, i knew the guide existed but i was never able to find it before. I'll keep it in mind for the future!

Remember to prioritize confidence over accuracy. I can see a tiny bit of wobble in many of your lines and especially ellipses. Make your marks as accurately as you can without losing confidence. Once you start drawing the mark you should already be confident in the movement if you've applied the ghosting method properly.

For your boxes i think you should try to remember the convergence. In both the rotated boxes exercise and the organic perspective exercise a lot of your boxes have parallel lines where they should converge much more. Again i suggest you use the ghosting method to find a direction that converges before committing to a line. But you'll have plenty of time to practice that if you move on to the 250 box challenge

I can see you put a good amount of care into your marks as you rarely miss the starting point of your lines. In the ghosted lines exercise i do see you often miss both of your points, so i would recommend taking the time to place your pen down before committing to the line

With your ellipses in planes i can see that your ellipses get distorted with the more distorted planes. Remember to draw the ellipses confidently, even if you miss the edges of your plane

Otherwise all you need is practice. While your marks are not perfectly accurate, you're still avoiding guesswork whenever possible

You're following each exercise as intended. Some of your mistakes seem to come from carelessness, but i can see you have the right idea. Just remember to have patience