1. I think that in the arrows exercise, the depth is little less visible. Maybe vary the size of the arrow. It looks like it is all the same.

  2. Also the curves are too steep. It will help if loosen a bit.

  3. In the eclipse drawing the section. The eclipses are way off. It is not looking like contour lines by like a texture.

  4. Also in contour lines second part. The eclipses are the end part need to curve a little to show some depth.

  5. I think you could work on form intersections but that exercise was supposed to be hard.

I think you did good job overall. I really like the texture part of the exercise. I also need review in my work. Could you please review.

https://drawabox.com/community/submission/DVMYA9KI