Wasn't really feeling it this evening. Luckily, we had one of the better models. I tried a couple of different types of charcoal. Some 1 and 2-minute pieces:
These are probably a 5-minute pieces.
This one starts with a gray charcoal background and picks out the whites/lights by pulling charcoal off the page. I was getting close to getting her right hand in good shape, but ran out of time.