8:23 PM, Thursday August 12th 2021
Good evening!
That is a lot of hard and good work. You took your time with each box, your lines are confident and mostly accurate. You were quite decent from the start, and you have improved by the end.
One common theme you've probably noticed is that hidden corner and edge leading to the VP. While it's very hard to get it down accurately (even the slightest deviation in any other edge will misalign it), getting it close enough should give you the ideal box for the purposes of drawing. In that sense, missing by a little is ok, going wildly off leads to a non-boxy shape altogether.
Still, as you have shown, practice makes perfect.
Next Steps:
You've improved as I said, and you can expect to improve more as you practice Lesson 1 exercise, and boxes. Yeah, you're not done with them yet! Do a few arbitary ones for accuracy, but also start putting them together in stacks to train your mental accuracy even more!
Feel free to move to Lesson 2!