These are all just really quick sketches, the time varied between 5-15 minutes. The first set are from a couple different nude drawing sessions, the second are of my fellow students who modeled in my class, and the last picture is just a hand study thing we did for a bit in one class.
There was a week between these (Above) drawings and the ones below. I can see an improvement.
The Drawings below are all from my class this last Thursday.