A sketch I did shortly after The Dark Knight came out. Took a bit of a while.
The source image I used was from a screen shot of the scene after the Batman-Joker interrogation scene, where he was sitting on the floor mouthing off the man standing in front of the door. If you picture-google The Joker you'll see it eventually.
I have a mediocre scanner, and my sketch technique isn't that great anyways. Also this was done on copier paper I think.