I posted awhile back looking for some critique on skin tones and got some really nice feedback. Since then, I've decided that the best way to learn to paint skin would be to paint from reference. I'm trying to paint at least one quick portrait a night (using a photo reference), and keep my time limited to under 20 minutes so that I don't get too hung up on little details.
Anyway, here are my first four. What do you think?