To start things off, here's an older page of life drawing sketches. The model's name was Paul and he held very still- which offset the fact that he looked like how DaVinci drew himself, which was admittedly a little off-putting.

I have great respect for anyone who can be comfortable in front of 15 pen wielding students. Paul managed to stay not only very self-assured, but kindly interested in our floundering attempts to capture him on paper.