Thor Ragnarok Fan Poster

Hey guys and ladies, that's a project based on the comic book cover From Todd McFarlane (to see the inspiration, click here: http://3.bp.blogspot.com/-3puKCYWe9t0/T9-uYjaPrmI/AAAAAAAAAZw/vNTbPN3P3qQ/s1600/HulkWolverinePosterRemasterSM.jpg)
I try to make a colosseum in background, but the result don't look so good much for me. I prefer the clean version with a simple green-color background and the logo title from the movie.
Critics, ideas, and suggestions, please write on the comments, I aprecciate this so much!
Tahnk you all!