This outfit? Is amazing. You actually pull Dante off pretty well. I don't really see any flaws with the outfit itself, but there are three things I do have a problem with.
Ebony and Ivory: I know that you need those guns for Cons, but since this looks like its away from the convention (I could be wrong) You should have made Ebony and Ivory. To look more like...well. Ebony and Ivory. For photo purposes, not con purposes.
Rebellion: There are MANY, MANY tutorials on the internet to make Rebellion. Your just looks like a random sword to me, I apologize. D: But maybe you should look into the tutorials, or commission an actual rebellion?
Wig: The wig seems oddly cut. The bangs are a little too short, and the wig seems more bob-like to me. And Maybe thin it out a bit too? Its also a bit too puffy which is why theres the bob effect.
Over all, however, I really do enjoy this cosplay. I'm not bashing you at all, don't worry! I'm just trying to give humble advice. :3