Hi there, I'll be handling your 250 box challenge critique.

First of all congratulations on getting through the challenge, drawing 250 boxes takes a lot of willpower.

You have improved through the challenge and I can see that you're thinking about 3D space more consistently.

One thing I do notice however is that you still suffer in places where your lines diverge or converge in pairs rather then converge as a set of four. (Box 242 is a good example of this) This leads to some of your boxes appearing skewed or like they end up wider in the rear then they are up close to the viewer.

You may find this example helpful. It shows how a set of lines relates to it's vanishing point. Notice how the inner pair of lines will nearly always be identical, while the outer pair can vary quite a bit depending on how close the vanishing point is to the box. The further the vanishing point is from the box the closer to parallel all the lines will become, but they should never diverge.

Those errors aside your linework is looking good, it's tidy and confident. While some lines still converge incorrectly or diverge you are getting more consistent and improving your grasp of 3D space, hopefully with a bit more practice and understanding you'll continue to improve.

I'd say around box 200 is where I notice you hitting your stride and beginning to become more comfortable, your instances of skewed boxes also goes down from here onwards.

Overall you have made a notable accomplishment, not only have you improved your knowledge of 3D space but you've shown everyone you have the discipline to sit down and work towards improvement. I'll be marking your submission as complete and moving you on to lesson 2.

Good work so far, keep practicing former exercises and boxes as warm ups. Don't forget to split your time with drawing for yourself as well.

Good luck in lesson 2!