How To Improve- Do not place the render in the middle! That is something that you have to stick in your head as you make signatures. The text I am not gonna harass you on because even the best have problems with their text but to improve your text one major thing I see is that you did a drop shadow. I have never seen a piece that actually looks good with a drop shadow. It is very hard to blend in. Try some more basic text like kravitz or arial if you want your piece to look more clean. Last but not least i blending. Now this signature needs blending. Some signatures you can get away without blending though. An easy way to blend your signature is to put some stocks over it, preferably a texture. All in all I think you really just need more to the signature if you know what I mean.