Hi, I've just finished lesson 1 myself. I'm not experienced with critiques yet so feel free to just use this as a second opinion rather than a sound and complete critique.

Also, sidenote: imgur has a rearrange feature that lets you order the images. Try to keep this in mind for the next submission since it makes it easier for the person critiquing to go through each exercise in order.

Lines:

Excellent work! There's not much to say here: you have a little wobbling, but that much is expected since this is the first lesson, and it will get better with time. The exercises have all been completed according to the instructions. However, it does seem like you've skipped ghosted planes. The ghosted planes and ellipses in planes exercises are supposed to be separate exercises, so please add those once you've done them.

Ellipses:

These look good to me, but it seems like you've been going around your ellipses too many times in the ellipses in planes exercises. You should go around the ellipse twice, but it seems like you've gone round more than that. If you do it to much, it can clutter the original shape the ellipse was supposed to have, and just make it appear thicker than it should. As always the aim is never to get a perfect result, these exercises are for learning. If you're not satisfied with how it went or feel you did it wrong, it's important to just accept it and move on rather than going around again to try to correct it.

Boxes:

Good work once again, but there are a few things I noticed here. In the rough perspective exercises, it looks like some of these lines have been drawn more than once: this is not correct. Again, just draw the line, ellipse etc. and move on, even if it wasn't what you wanted.

Also, your rotated boxes look a little stiff to me; there's not very much rotation. Ideally, the whole picture should look similar to a sphere, rather than a box (the lesson material has a good example of a completed rotated boxes). It seems like there's too little convergence in the parallel lines, particularly in the boxes that run horizontal in the scene. There should be a steeper angle from the side closest to the center to the side closest to the side of the page (to the right side for the boxes on the right side of the page, and vice versa for the left).