"The Killing Joke" Joker
This piece was originally drawn in a random notebook I found on my desk, and it ended up being one of my most successful pieces of art ever. After sketching it, which took about one and a half hours, I uploaded it to photoshop to color it in.
The Joker is a homicidal maniac who is obsessed with driving people mad, so with that in mind I tried to make every aspect of him look mad. The mangled teeth, ratty hair, dark eyes, and oddly positioned fingers around the camera all add to the madness.
Made it to the top of the Batman sub-reddit!