After reading all the comments I gotta say, though I don't disagree, I am a personal fan of fiery sketched out work. This already captures Wolverine perfectly. Giving the hands and claws a bit more love, as you did the muscles and face would finish this in my minds eye :)
Being able to feel the sharpness of his blades is apart of the character design that makes Wolverine my favorite silhouette.

Having said that if you finish this (and it sounds like you will) It is sure to be awesome!