Drawing Practice - Bowser

I don't doubt my drawing abilities, but I do know there's always room for improvement, so I decided to push myself to draw something I normally wouldn't to see if I could do it.
I think I did well, compared to how badly I could've done. Bullet Bill kinda looks like a derp though.

Drawn in mechanical pencil, and took waaaaaay too long. 2 days :/

These guys belong to Nintendo.