/ic/ - Artwork/Critique

I'm trying to practice the Loomis stuff, and I'm having a pretty hard time with the ball plane bit. It's hard to see myself using this technique, since I've been drawing for years but just now started Loomis, and I'm having trouble making the lines right, and I had to copy all the distinct little facial features from the book, so how will I know where to put distinct features in other faces? Here's something I've done with it most recently, I guess am I on the right track?