Congratulations for completing the 250 Box Challenge!

You did a good job on the challenge overall. I can see you made some good improvement with the quality of your mark making. Your lines steadily become straighter and more confident looking as you progressed through the challenge. You also start to do a better job of getting your sets of parallel lines to converge more consistently towards their shared vanishing points!

I would recommend that you try adding extra line weight to your boxes as a permanent step for your future warm ups.

When you go to add weight to a line it is important that you treat the added weight the same way you would a brand new line. That means taking your time to plan and ghost through your mark so that when you go to execute your extra line weight, it is done confidently and so that it blends seamlessly with your original mark. This will allow you to create more subtle and clean looking weight to your lines that reinforces the illusion of solidity in your boxes/forms. Extra line weight should be applied to the silhouette of your boxes. I recommend that you try adding your extra line weight in no more than 1-2 pases so that you can easily identify mistakes in your work. This diagram should help you better understand how to properly apply your extra line weight.

Some of your boxes were drawn a bit small, I also see that for a few pages of boxes, you did not abide by the 5-6 boxes per page limit. and this forced you to draw many of your boxes quite small.

Part of the reason for the 5-6 boxes per page rule is so that students have enough room to draw their boxes larger while having room to check their convergences. By drawing your boxes very small you limit your own ability to execute your lines from the shoulder confidently, which affects the quality of your mark making. Drawing bigger also helps engage your brain's spatial reasoning skills, whereas drawing smaller impedes them. It isn't a problem if your line extensions end up touching other boxes on the page so long as the boxes themselves do not touch or overlap. This should give you enough room to draw your boxes at a larger, more useful size.This, along with varying your foreshortening and orientations of your boxes, will help you get the most out of the exercise.

I did see that you were checking some of your not always checking your convergences.

Checking your convergences is an important step so you should always take your time and do not skip any steps. Noticing and identifying mistakes is a major part of the learning process. Checking your boxes for mistakes is how you know what areas you need to address so that you get the most out of each exercise.

Your line extensions should extend away from the viewer and towards their implied vanishing point. You should do this for all three sets of lines that make up your box. They should never be coming off of the center of the original Y that you use at the beginning of your construction. Be sure to visit the link for more information and for examples that you can use as reference. You can refer to the diagrams in this link if you are ever confused or uncertain.

Finally while your converges do improve overall I think this diagram will help you as well. When you are looking at your sets of lines you want to be focusing only on the lines that share a vanishing point. This does not include lines that share a corner or a plane, only lines that converge towards the same vanishing point. Now when you think of those lines, including those that have not been drawn, you can think about the angles from which they leave the vanishing point. Usually the middle lines have a small angle between them, and this angle will become negligible by the time they reach the box. This can serve as a useful hint.

Congrats again and good luck with lesson 2!