If you've never tried it, I recommend trying Life Drawing. It really took me out of my comfort zone, and was a a great experience. I had the pleasure of taking an intro course with Justin Ogilvie of Basic Inquiry in Vancouver.
These drawings were multi-colour, multi-pose, and multi-artist. I did half of each of the following:
[caption id="attachment_497" align="aligncenter" width="220" class="center center "] In this drawing, I did the side profile as well as the scratches (blind) to the face and neck. I tried to incorporate the torso with the head, leg with the neck and the foot disappears into the left breast.[/caption]