Hey there Anteros, I'll be handling your critique. Apologies for the delay we've been getting a lot of submissions recently.

First things first, you deserve to be congratulated on completing the challenge. It's a lot of work, and a test of willpower as much as anything else. By the sounds of it you're pretty harsh on yourself and didn't have the smoothest time going through it.

With that said I will say that you did improve through the process, it may not be mind blowingly obvious because at the end of the day they are just boxes, and you did have some solid ones to begin with but there is improvement here.

So I'll say around box 125 is when I feel you made the first noticeable step towards having your lines converge towards their respective vanishing points more consistently. Before this there are quite a few cases where in your sets of lines, rather than converging all at one point, they'd often pair up in groups of 2. Later on around box 175 I feel like you managed to take another step in the right direction and become even more consistent and solid looking. (you acknowledge this yourself by starting to compliment a few of your boxes from this point onwards.)

This exercise tends to be deceptive to some people because they feel like they don't improve or even possibly get worse by the end. What they don't realize though is because they're drawing a simple object so many times, they very gradually improve in small ways, even in terms of muscle memory and how you think while working on future drawings. As you mentioned you now think more about perspective while working on your own work which is great, another thing I'll point out is how much your linework improved in things like your hatching. A lot of people take it for granted but if you look at the last 25 boxes compared to the first 25, notice how much more confident, evenly spaced, thought out and accurate your hatching is now. It's a huge improvement of over the wobbly lines that didn't even reach or overextended the edges you created.

One last thing I'll touch on quickly is you said:

"The later boxes do look a bit better than the earlier ones as a whole, but I can still find really bad and sort of okay ones in both places."

While it is true you do make mistakes in some of the later boxes as well, what people need to sometimes be reminded of is that they are human, not a machine and that we aren't expecting perfection, just your best attempt.

You'll always make mistakes, pros do, people who post amazing art work on social media do too (though you may not see it cause they don't feel the need to show it off.) the goal is however to become more consistent so you make mistakes less often. Which you did, your last few pages are great.

That's enough of that though, overall you did a good job and you managed to get through a very draining challenge. While it may not have been fun, and you may not be able to see as much progress as you'd like, it paid off and you don't need to go through it again. One thing you may want to experiment with more in the future is line weight, it can really make your images (boxes or non-boxes) stand out on a page if applied correctly.

I'll be marking your submission as complete, and moving you on to Lesson 2.

Great job, and good luck.