The render kinda just looks slapped on. Blend it a bit more. The line in between the text doesn't seem to fit that well. Ruins the background that seems real cool.
For some reason, I don't like the render. I just don't think it depicts the image of the signature well. Sure that guy is buff, but he's not ripped . Just not the type of render I'd expect to see. However, I do like the colors, and effect of the background, I'm sure if you had another render, it'd be damn near perfect. 9/10. You still get a cookie for effort. BUT THAT COOKIE IS ON FIRE! AHAHAH!