I love the linework and coloring of the piece.
The drawing also gives a good intimidating pose that is accurate to the game.
I think really the only thing that would make this really good is some more intense lighting.
Make it dramatic! I think making it more varied with light and dark would make the overall piece stand out better to the viewer.
It's almost a little too gray everywhere.
Anyways, I hope you keep improving and I can't wait to see what you do next!