I like the idea of this drawing, but not so much the drawing itself. The lighting seems fine until you see the shadows beneath the characters. I think you could've put more time into designing different and more elaborate weapons, it could've been a way to show individuality between your characters, an oppurtunity squandered.
With that said, I really wish you would've spent more time on the background, it seems so different in style with the foreground, that its almost like you slapped two different artworks together. All in all, this is a poor piece, you need to put in more time and effort into your foreground AND your background.