Heya, hope it's not too late to have your work critiqued!

You've certainly improved your boxes overtime, and you've kept your marks pretty confident throughout the boxes.

There are some times where you didn't check the convergences of a set of lines (either that, or whatever you scanned these pictures with brightened up some lines to the point of being invisible). It wouldn't hurt much to check some of those convergences.

One thing I see with this submission is that you tend to draw more boxes with exaggerated/dramatic foreshortening, and not many boxes with shallow/less dramatic foreshortening. A good amount of the vanishing points stayed on the page you were drawing in (some vanishing points even stayed close to the boxes you were drawing).

In the times where you didn't have the vanishing points physically on the page, most of the line sets were too parallel. Even though in actual space, the lines in a set would be parallel, when drawing them, they would never be parallel. The lines would always be converging, even if it’s just by a little bit.

It's best to experiment/see how you handle drawing both types of foreshortening. If you don't feel confident in your ability to draw boxes with less dramatic foreshortening/boxes with vanishing points far from the boxes, I'd suggest trying your hand at that before moving on to Lesson 2. Try doing about 10 boxes if you feel like you unintentionally leaned away from making boxes with shallow foreshortening.

You'll get better with these types of convergences with practice, and these mistakes will iron out with some effort.

Try to think of how every line in a set will behave/converge in comparison to the other lines of the same set, and then draw them. Here's a diagram to give an idea: https://i.imgur.com/8PqQLE0.png

I would also suggest experimenting a bit with the orientation of the boxes. Just a little, because you did have some variety in the last few pages of boxes. Here's a diagram with different orientations of boxes: https://imgur.com/Kqg6uMX.

Try not to copy them. Just have a glance at some to have fresh ideas of box orientations.

Other than that, good work with the 250 box challenge, and congrats powering through them!