Not sure if you're not into C4Ds or anything since your other tags dont use em either. See you tried playing with lighting in it to give it some depth but I think it might be a bit to much. These turorials might help you out a bit
You must login or register to view this content. You must login or register to view this content. To me it looks like you're going for a background kinda look other than a signature. Maybe use a larger canvas and see if that helps you out too