This is really great, the details, the anatomy, the coloring and the subtle use of blur. But there are a couple of issues that could improve this a bit. Parts of this as so dark its hard to see that there is blood on the Joker's hand or Catwoman's leg. Perhaps giving the liquid a couple of highlights or just brightening the blood would help. This is I guess more of an aesthetic choice for me but I would have made Batman's pose more energetic to show that he has thrown something, because it was so subtle that I didnt see it at first glance. Youre probably going gor more realistic that a comic book approach Im guessing, so like I said thats just a personal nit pick on my part. But still fantastic work! Its well done and it tells a story all in one single image and those are always the best pictures if you ask me.