I'm still starting out here, and this would be my first critique, so feel free to use this as a second opinion, but here's what I think regarding each section.

Lines

You seem to have done an excellent job with the lines, following the instructions carefully. I do suggest though practicing to lift your hand a bit earlier, as you've got some of your lines overshooting in the planes exercise. I believe this comes with practice, though, and other than that your lines are good.

Ellipses

Great job with the ellipses as well, you correctly got them to fit into their containers for each exercise, going over them twice/3 times max as instructed. What I do notice, though, is that some of them are a bit wobbly, so I'd suggest you draw a tad bit quicker when you've ghosted a confident amount of times before plotting your ellipse. Also, try to keep the ellipses in some examples in the funnel's exercise a bit more close to each other, where they'd touch each other ("fit them snuggly").

Boxes

You've done a marvelous job with the boxes, to be honest. One tiny comment, though, would be that once a line is drawn, you shouldn't go over it again. Going over what you've drawn for a second/third time only applies to the ellipses for this lesson; other than that, any line drawn should follow the ghosting method and only be draw once, then continue according to that line even if you feel it's a little off. Other than that one comment regarding the lines of the boxes, you truly did a perfect job, in my opinion, with the boxes' exercises.