Hi there. Ill go ahead and give what critique I can here.

First off is your lines. They wobble a fair bit, and a lot seem to arc just a little. Luckily we only have to work on one of those things at a time, and we should start with the wobble. My biggest piece of advice would be to try to make the mark faster. Ghost your lines quickly, and once you feel like you have the right angle to make the mark, put the pen down and make the line as fast as you can. With any luck youll have gone from your start point to your finish before your brain even has a chance to tell your arm what to do. Making lines this fast should help you lighten up on your pens too, which will make them last longer. Ultimately you want to feel like your not dragging the pen across the page, but quickly and lightly striking it with your pen. As for your slight arcing, first make sure youre drawing from your shoulder. If you still find your lines arc, youll have to make a consious effort to arc your lines in the opposite direction than what youre naturally producing. This will feel weird for a bit but after a bit youll naturally straighten right up. Of course priority goes to making smooth lines; a smooth arc is better than a straight but wobbly line.

Your elipses are pretty good. Theres a few in your tables that overlap and some in the planes go out of the bounds, so you should still try to practice them a bit, but theyre smooth, which is great.

Your rough perspective and rotated boxes all roughly go to the vanishing point without much issue, which is good. Id like to specifically call out that in just the two pages of rough perspective it looks like your accuracy improved a bit. Six scenes is a vey low sample size so there could have been other factors, but I like to call it as I see it. However on your organic perspective where you dont get a set vanishing point it seems you defaulted to trying to make each set of lines parallel. In reality when you have boxes in 3 point perspective every single line converges towards a vanishing point. It may be a slight convergence, but lines are never parallel and when you try to make them so line can even end up diverging towards a vanishing point instead of converging, which can make for some reeeally weird forms. You also seemed to default to trying to make all the boxes cubes, which might end up costing you some valuable experience if you dont watch out for it. Luckily, theres a simple way to help with both of these issues. First off when you go to do your 250 boxes youll find a link to a Y generator somewhere on the info page. Use that. I think its recommended to not use it past your first 100 boxes, but by then you should be more than comfortable making asymetrical Ys. More importantly, as soon as you have your Ys, plan your vanishing points, even put dots on the page if you need to. Experiment with VPs that are close to your box and others that are far away. This will help you see just how sharply or subtly your lines will converge.

The 250 box challenge is all about tackling the concept of form and depth head on, and thats definately your next step. Id also reccomend when you go to draw boxes for the challenge, you start with a 15 min warmup of ghosted lines and ghosted planes. Practicing making quick, confident lines is a great warmup and should help straighten your lines out. Best of luck with your next step!

Try drawing your lines FASTER, so that your mind doesn't have enough time to make wabbly lines.

It's not about the ellipses themselves, but the lines you used to divide the table. It seems like your are not comfortable with controling your shoulder joint smoothely because the lines are bold and kinda stiff. Try putting/using less weight, it gonna help make the movement easier.

Ghost more.

Line weight again for organic boxes, increase the weight for the boxes that are in front of another.

Your boxes gonna be better as you do 250 box challenge, so good job for now :).