Congratulations on completing the 250 Box Challenge!

Before we begin I just want to mention that in the future, when you go to scan your homework submissions, it would be better to scan your homework using the "photo" setting instead of the "drawing" setting. The drawing setting tends to up the contrast on an image and can cause you to lose some of the subtlety in your line work.

You did a really good job of keeping your line quality consistent throughout this challenge! All of your boxes are well constructed with straight, confident lines. I can also see that you do a better job of getting your sets of parallel lines to converge more consistently towards their shared vanishing point as you progressed through the challenge.

One thing that can help push your boxes a bit further is adding line weight as shown here. 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 it the mark blends seamlessly with your previous mark. This will allow you to build and create more subtle and clean looking weight to your lines.

Finally while your convergences do improve overall I think this diagram will help you further develop that skill as you continue through Drawabox. So, 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.

You did really well overall and you maintained a strong, consistent quality to your boxes that only grew over time. If you keep in mind what I've said here, you should continue to see improvement in your work.