Hello Mamind congrats on completing lesson 1. Here are my thoughts,

Superimposed Lines: Arching on those longer lines. This diminishes with practices but you can also consciously arc in the opposite direction. I'd also like to suggest that you try more complex curves like s curves for example.

Ghosted Planes: Remember that at most you should be going over your ellipses 2-3 times.

Rough perspective: Some of your lines are extended past the horizon line, I'd advise against this since it makes it a bit messier. You should also remember width lines should be parallel to your horizon and height lines perpendicular to your horizon.

Rotated boxes: nicely done, though I suggest you employ hatching to help clarify everything.

Conclusion: Overall a strong submission, not a lot of errors to point out. I have no issue with marking this as complete. Good luck on the 250 Box Challenge and have fun.

Best of luck moving forward

-Slyx