Friking love how not just one of them, but both Batman and the Joker are totally breaking out of their tense moment of a bloody fight, just to glare a bit at that female Robin. xD Brilliant expressions, and the poses, style and expressions look perfect with this, despite the grim content XD like the Joker's eye getting stabbed for one thing O.o
Uhm... really nice picture - but I must say, you got her haircolor wrong here. She doesn't have brown hair; it's supposed to be bright orange. I mean, maybe you are colorblind - and in that case, that's cool. I just wanted to point it out.