Great make-up and costuming. The overexposure effectively makes the character and costume coloring pop. The angle is particulary effective is playing up the facial expression, hiding any body proportion imperfection and any make-up flaws. I'm not saying that the latter two exist, just saying smart choice fpr cosplay posing if you explore other characters where that may be an issue. THis got my vote. Play heartily. Create robustly.
I have to admit, this is probably the BEST cosplay I've ever seen having to do with the Joker I actually thought it was Heath Ledger, and was trying to find out what scene it was from in the movie VERY WELL DONE!!