Overall it looks good! The line exercises look good, especially the ghosted lines.

When it comes to the ellipses, remember that confidence is more important than accuracy. Don't worry to much about how thick or thin your ellipses are right now and focus more on the keeping them smooth and even.

I noticed in some of the boxes of the rough perspective exercise, one of the back lines heads way off into the distance but other than that it looks good.

When it comes to the boxes in the organic perspective, make sure to make the all lines in a set of parallel lines converge more or less towards their vanishing point. The 250 box challenge will help a lot with this.