Lines are p good in general. Only thing I can notice is that you aren't marking the starting and ending dots before drawing some lines on the ghosted planes, you should do it with every line.

Ellipses are p good, though a bit wobbly. Remember that confidence is always more important than accuracy in drawabox. Don't hesitate to sacrifice accuracy to get the ellipses as smooth and confident as you can.

Boxes look good in general, though you have an important mistake, which is repeating lines. No matter how off a line is, don't repeat it, keep going as if it was correct.

You can add lineweight with a single superimposed line to parts that overlap, to clarify the relationship between 2 boxes.

Perspective has issues on the organic perspective, but dont worry, you'll work on it on the box challenge.

You're missing also the funnel exercise, marking this as complete as you're doing a p good job, but feel free to post the funnel here if you want me to look over it.