When the challenge "29 Faces" first ran (a year or two ago), I thought that I couldn't draw a face for the life of me, so I didn't participate. I felt a little left out, frankly, I guess because I wished I could give it a try. And now I can. I just heard that the challenge is running again this September, so I'm a little late to the game, but the idea is to draw 29 faces in 30 days, or at least as many as you can. I'm going to give it a shot.
If you'd like to try also, head on over here to the 20 Faces blog.