He/she (?) does look like a monster, but though impression comes across the rest seems pretty sketchy! Green tail but white character? Gives the impression the coloring's not complete. The sketchy line work and signature, and blotchy background, all makes it seem it's a bit rushed too. Maybe the style and form's not bad, but as large as it is it looks a bit basic. Good start, but you can do more refined I think. ;) Keep it going!
-cd-