Your ghosted lines arch a bit, but I can see it got better with the planes exercise.

The ellipses I'd say are pretty confident. They sometimes slightly don't touch the plane. I see you draw through those ellipses in planes more than 3 times, making this "thick line" effect - I recommend going over 2-3 times so their outline is clearer (less thick).

In the rotated boxes exercise I think the rotation is sometimes unclear (https://imgur.com/5hRf03g). At times the corners weren't close to each other (https://imgur.com/a/fhD4eYY). Also this one's convergence isn't right: https://imgur.com/a/81iyiIc .

In the rotated boxes exercise I noticed the lines got wobblier (could be because of being cautious). Watch out for tangents, as they can flatten the image: https://imgur.com/a/cwtC3Z1 and applying dramatic foreshortening in far away things: https://imgur.com/a/n8bUffx .

And that's all I had to say here for now.