I did a self portrait for my life drawing class, and I think I like it even more than that other portrait I did a couple weeks ago. You can see that here:
http://jcummingsart.blogspot.com/2013/01/self-portrait.html
This portrait, done in charcoal, took about 3 hours.
Looking at it now, I can see that I need to work on building the structure longer before I get carried away with rendering. This is one of my favorite drawings to date though. I'm getting confident enough with charcoal that I can start playing with lost edges and other fun little tricks. I am thoroughly enjoying myself lately.