Hi, good improvements already.I like the figure analysis work and that you are practicing your 3d volumes. The last exercise you posted is a great idea Id say to practice it with boxes as well.
Also I think it would be worth doing a few pages of ellipse drawings every day if you can. Like Marcs circle trace exercise, but just many many more of all different sizes and degrees.
I think this example is a really nice way to visualize how ellipses work in perspective.