I can't even really tell what your background is. Sometimes when dealing with a large character image that takes up most of the space, like this one here, you have to be creative what space you have left to show, try some bright effects or something to really catch the eye and direct it where you want it to go (like right between the characters, etc). Your text is too low as well, it'll get cut off by the task bar for most Windows users. Thing about where you want the user to look, and try to creating something interesting with what space you have left!