I feel like I'm making some progress, but it's still hard to negotiate the vanishing points of all the different sets of parallel lines. In box 8 and 9 I marked that I thought I shaded the wrong side, but when looking again it does look like those are the sides the face the viewer the most.

I started out trying to do 2 pages a day of boxes, but switched to just one and feel like the results are better since I can concentrate more.

Sometimes I plot the line in my head while ghosting and then as soon as I make the mark I can see that it's wrong. Is it ok to ignore those marks and try again, or do we want to commit to the mark we make even if we know it's way off? I guess I should take my time more so I don't have incorrect lines in the first place.