I would love to see how this would look with a little more blue introduced to the bg (the same shade you've used for the text). The above recommendations have helped your wall along and I think that keeping the simplicity of this wall is still in your best interest. I might even suggest perhaps trying different sizes of him on your wall, like perhaps making him bigger and cutting off portions of the space lingering above his head and below his feet. In any case, you've done a good job with this wall :)