Hello Stiest and congrats on finishing the challenge! I think I'm seeing boxes in my dreams as well, so it's nice to know I'm not alone in losing my mind.

With regards to your linework, I see confidence in some sections so good job! I will say however theres a fair bit of wobbly line, under/overshooting and line fraying. This is all totally normal so I wouldn't worry too much, however it is important to keep practicing so that your confidence builds via ghosting lines and practicing superimposition. A confident, inaccurate line is better than a hesitant, accurate one! I've also noticed some of the lines that describe the inner corner of the boxes have been redone (e.g. 118). While I totally get the desire (I have to hold back the temptation to do it to everything I draw), it detracts from selling the 3D form and thus is detrimental to the goal you're trying to achieve. Apply all of this to your hatching as well, with a bit more density in the number of lines, though this may be my personal bias I'm not sure. Focussing on improving all the elements I previously discussed will invariably help to sell your boxes as real objects.

As for the structure of the boxes themselves, I definitely see improvement with convergences, though there are still some issues. Having just finished the challenge myself, I know how frustrating this can be, as I still have convergence issues myself - particularly with the inner corner (this is due to the sum of all mistakes that came before). They will resolve in time, though what helped me was to make a point of looking at relationships between lines within each set of 4 (for which there are three describing the dimensions of space) as separate from the sum that makes the box itself. Ghost these lines out into space to ensure they all are going to the same vanishing point as best you can. Some more variation in your boxes as well would certainly help! While you definitely have variation in box length/width/depth, I'd play around with the initial 'Y' a bit more. For instance you could have the angle describing the relationship between two of the initial lines be a lot closer to 180 degrees, which would create a face of a box that is just barely visible, with a lot more emphasis placed on an edge, rather than a corner. This would utilize two-point perspective more than 3 (meaning you only focus on converging the two horizontal sets of your 3 line sets and leaving the vertical one pretty much parallel) which I believe would give you a more rounded learning experience. I THINK that this is right (it's what I've been trying to do, though it's hard for me to describe this through text alone and the site does a much better job of explaining https://drawabox.com/lesson/1/6/123pointperspective . Please feel free to call me out on anything I may have gotten wrong, as I want nothing more than to learn and do this right myself.

I also share your sentiment with drawing everyday creating some sort of structure. I think building the habit of drawing everyday is arguably just as important, if not more than what we're actually learning here. That's definitely my opinion though. I wish you all the best in your drawing journey and I hope to see you around as we go through lesson two (and the 250 cylinder challenge lol).

Peace,

Jekettex