This is the second (I like it a lot more than the first) signature I've made and I know it is really simple but I like it and I feel proud that I was able to do it.
hmm.. for a first work they look good.. the problem is with the quality of the render... try looking for tutorials and I'm sure you will get the hang of it ^^
2 simply , i think you are new to PS .. i would suggest that you try to learn something from Diviantart.com and GFXResource.com ... you know , downloadl tutorials , C4Ds , HQ Renders ... etc