The original artwork by Jim Lee looks better in my opinion. But he is an artist with decades of experience, so nobody expects you to be as good as him.
I think you did a decent job there. The only thing I would change is making the wrinkles on his forehead and next to his nose a little bit stronger to (to define his facial expression a bit more). But you already got the proportions right and captured the dynamic of the picture.
newgrounds.com — Your #1 online entertainment & artist community! All your base are belong to us.