Some other Los Angeles animation professionals and I have started a "sketch club" in the Miracle Mile area. We've been picking random people on the street to all draw from memory and posting the results here:
MIRACLE MILE MARKSMEN
Subscribe, comment, and enjoy!
I've been doing mine by sketching the person loosely once I get back from lunch and then fleshing out the illustration on my Cintiq at home in my spare time. It's been a great way to stay sharp and a good outlet for trying out new styles.
Hat tip to Marcelo and the rest of the Sketch Club in Culver City for showing their support.