Second Attempt, Great Instructor

After my instructor's feedback, I was anxious to have another crack at my recent back studies. I stayed within the suggested time limit this time, which is a first for me. I think it's actually better than the first, which took me close to three times as long. I tried to focus on the large value planes as my instructor suggested.

18x24, Charcoal, 30-40 mins:

My instructor is pretty thorough with his critiques, which is really helpful. Take a look at some of his amazing work below. Yeah I think he's qualified to teach anatomy, don't you?