Let me start things off by saying you have done a very excellent job! The first lesson can be really daunting at some points especially at the Rotated Boxes assignment.

With the Ghosted Lines, you do a great job maintaining focus on accuracy and aiming to go from point to point; however, you do have some small wobbling and this slight wobbling can be seen in some of your lines in the Planes assignment. Going forward, try focusing on straightening those lines, what helped for me is drawing at a faster more consistent speed. You'll be getting a lot of good practice in the 250 box challenge but it also never hurts to draw a few lines as warm up too.

With ellipses you are doing a good job maintaining constant velocity and that shows with how smooth the ellipses are. With ellipses, I recommend you focus on accuracy and make sure you hit all the edges of the walls.

You did a great job with the Rotated Boxes assignment and you grasp it well especially with the planes of the boxes facing towards the viewer. The back faces do get a little scattered once you start drawing boxes about 2 away from the center box especially near the upper side and upper-right side. Its good to use adjacent boxes as a reference with helping out where to draw the boxes.

All-in-all, I think you are ready for the 250 boxes! Keep marching forward and keep up the good work!