Your work looks good, but I did notice a few things that you could continue to work on. Firstly, your lines wobble quite a bit across lessons. It looks like you are ghosting but then may be not following though on the final pass of the pen with the same motion, trying to mentally keep the line straight instead of relying on short-term muscle memory. 

Also, I noticed on the ellipses you're often making more than two passes around each ellipse. I think the two passes are to practince quickly honing the shape you want, with one practice pass and one final pass. Three or four passes may not be as helpful as just two. (The first table of ellipse page has ellipses spaced a little far apart too, but that was solved in the second page.)

It's clear you know what you're doing and have taken your time on lesson one, so I don't think you need any revisions. Your grasp on perspective seems pretty good already!

The only point I have to make is that you are not using your shoulder confidently when performing your strokes. The lines are shaky, a consequence of the way you plan the lines while executing them, instead of planning before and executing after in a single confident movement. I suggest you review and redo the exercises on overlapping lines, ghost method and ellipses in tables.