I'm not the best signature maker, in-fact I wouldn't class myself as a signature maker, but I guess I could
try and offer criticism and hopefully it will help you.
First thing, would be the image you chose. If you are using an image, try to find a rendered image (an image that has already been cut out). These are usually more clean-cut.
If you can't do this, ask a user to render images for you. Sometimes they will do it for free, sometimes they won't. I have done it quite a few times, so I'm decent at it, jus' sayin' :confused:
Second thing to note would be the background you used. Try to stay away from solid colours, and mix it up. Blend colours, get a background that is pre-made and interesting, and edit it slightly. Make sure that it doesn't take away all of the focus of the signature though :carling:
I'm sure other people will have a whole load of advice that may be more educated or better than mine
Other than that, it's a great attempt at a first signature - and welcome to the world of graphics :tits:
//AC