I really like it, now what you need to do is somehow turn down that light blue on wolverine's mask to match the blue X in the background, and it'll blend in much better, instead of clashing so much with those background blue X's.
Here's what you might try to fill the empty space, make a duplciate layer of the wolverine face, and go Filter:Blur:Radial Blur then click Zoom and turn it wayyyyy up, see how that turns out, it'll make his face jump out a lot more, and fill up some of the gaps on the sides. You can turn the opacity down on the blur to see how it goes, just an idea to fill up some of the space on the sides.
-Luke