Thing in top right hand corner throws everything off for me, the effects are really contrasted and has too much depth, the master chief guy doesn't blend it much, and the text is a little poor. The effects look like it is fighting the chief. Try to blend the chief more with the effects, make him more of a central focal point, work on your colours, and use photo filters where you can, it makes things so much nicer, also layer settings are really nice to use, like soft light and overlay and such, also don't turn the contrast up too much, it can really ruin a signature.
It really looks like the effects are on a pane of glass in front of mc instead of next to him. I would try some blending, lighting and something on the left side, nothing major but it would help.