Sketch o'the Day...The Joker, Dark Knight style with a Copic twist

Hey all. So I finally had a chance to take my new Copic markers for a spin, and I gotta say, I LOVE them so far. I knocked this one out during my downtime working at the store today. Not too shabby for a first stab with a new medium. =D

If any of you guys are marker experts out there, feel free to critique and leave tips for my future endeavors! LOL