They have special sessions with live nude models once a week for people to practice their life drawing.  There is no instruction involved.  The model holds a pose for around twenty to thirty minutes or so.  I'm not anywhere near as fast or accurate as I need to be.

On a scale of 1 to 100, I would give myself an 80 on overall body/form.  I'd give myself about a 45 on the guy's face.

There are all kinds of important subtleties I fail to communicate!