Dr. Jackal

Whilst sitting around at school for hours after class I doodle in my sketch book and on this one i got a little carried away and this is the end result. I love his expression, to me it looks like he's thinking "meh, what harm could one more dose of mysterious chemical X do?"
I tried to make him appear dirty or ragged, like he hasn't left his lab in weeks(or months) but its hard to do with so much shading not to mention that I'm a decent artist at the best of times but its ok cause...

Im gonna be the very best,
like no one ever was,
dum dum dum dum,
to draw things is my real test,
to perfect them is my cause...