I've been going back and forth between drawing on paper and my ipad. So far, it has felt much easier to make smooth lines using a pencil and paper. On the ipad my palm starts to stick to the screen after a few minutes of drawing.
@Kiel-Ewing The contour line drawings turned out really well. Looks a lot better than my attempts at those exercises! I think you're definitely on the right track 
More practice on the ellipses could be helpful, especially if it was difficult for you. The more practice you put into it, the easier those pesky ellipses will become 
The only constructive feedback I can give you right now is about your linework. It's very "scratchy". I recommend trying your best to draw from the shoulder instead of the wrist. It really loosens up your lines and makes them more flowy. Try to make a mark in one fluid motion, instead of lots of small scratchy lines. It's not easy at first, but does get easier over time It's something I still struggle with from time to time!