the skeleton on the top-right corner is almost invisible, save for the skull. I suggest making it readable against any background.
Yeah, I agree. I think just giving him a brighter outline would do the trick, since I don't think he'll be against such a dark background that often.
Also, why the flat RaptureBoy? The first one you showed was pretty good imo.
Looking nice!
One thing I'd recommend though is smoothing the edges of the Fauxboy; I notice some 'jaggies' appear on what imo should be relatively flat lines. This is most noticeable on the top.