Some of these were indeed rough. Especially the beginning exercises where it seemes a bit rushed. Although lesson 1 encourages making confident lines, it doesn't imply that you should be making these lines as fast as possible. The goal in lesson 1 is cleanliness. The ellipses also need to be drawn over twice not once. I would advice you to not take the super-imposed lines and table of ellipses lightly.

On the other hand, your boxes are good. The lot of the boxes perspective are inconsistent but overall it only needs a couple of tweaks in order to be amazing boxes.

Good work.