The light source placement on the sig doesn't work. It is in the wrong location. The text has a faint outline that I personally don't care for. The tex is also angled incorrectly. It doesn't look parallel with the shoulder or the direction the body is moving. It also looks like the text is put on an image and not actually apart of it with the c4d's flowing thru it as opposed to flowing behind it. The top right of the sig doesn't seem to flow with the bottom left. You did work the render in well and the color scheme works perfect for the sig.
The bottom one looks good but the render does not blend into the background. The background is a little pixilated and the render not so much.
still good work, but I think that you have had better ones.