Hello I'm PGcools and I'll review your work.

I can see you have worked very hard and filled every page with abundant samples of the exercises. Now on to the review:

Lines

I have not much to say here, all your lines are drawn with confidence and placed where it should be. The only mistake I find is arching the lines, make sure you are drawing with your shoulder and not with your wrist or your elbow. If the problem persists, try arching the lines to the opposite direction while ghosting.

Ellipses

These are very good too, just a few overshoots. Also, I feel some of your ellipses were drawn way to many times, especially in the Ellipses in Planes exercise, remember they should be drawn only 2 or 3 times.

Boxes

At first your box exercises were fine but for some reason in Rotated Boxes and Organic Perspective you started to make line mistakes you didn't have before. There's a lot of wobbliness, arching and many lines drawn several times when they should be drawn once, in some cases it seems there are not even plotted. I recommend taking a lot more time to think before making each stroke, doing the ghosting method and drawing with as much confidence as you did in the line exercises.

Also, in Rotated Boxes you have rotated the central box 3 times to each side, when in the example there were only two rotations. This add a lot more boxes making it even harder to see the lines and therefore to drawn the boxes correctly. I think you should pay attention to what is asked for concretely in the exercises and that you shouldn't do more nor less.

Lastly, this is not a big deal, but I recommend to use clean paper for the exercises. It doesn't have to be new, you can use recycled paper or the back of a document. I think this makes you focus on the exercise a little. For warm-ups however, you can use whichever piece of paper.

Edit: I'm sorry. In the "Next Steps" field I accidentally put that you should move to lesson 2. Tackle the 250 boxes challenge first, as it is of huge help for that lesson.