sorry man but it looks really bad the text just does not go with the sig the background of the sig looks weird and the hair of the renders is purple for some reason look at some tuts here you will become better faster if you do work on belinding, lighting, flow and rember text is not need but if you wanna get better follw some tuts here and i garuntte you will get better sorry if i sound mean
doesn't look really bad....it just looks noob.... read up on some tuts and you'll be better suited to bring your concepts to the forefront....