To be honest and fair, I have to admit, I'm not really that big a fan of Batman. I feel he'll be absolutely butchered by others like Wonder Woman or Iron Man, but I have to admit, this piece of art is AWESOME. I love all the texture that you gave his suit and the Bat light in the background is REALLY cool. The way his cape drapes around him is really nice too. He should have been given a slightly longer neck though..
Otherwise, it is a fantastic piece of art, really great job. Do draw more superheroes soon .