That isn't a sig.
That is the exact same image with few effects applied, a border, and some text.
I suggest you look at some tutorials, or first, at least research what sigs are. As for what you actually made, it doesn't look bad, apart from that ever slight ripple in the background(thats not what everything looks like from far away, its a bit distracting).
Also, @w9xo, if you throw something together in 4 minutes, it isn't going to look good. Even at my level of experience with photoshop, only so much can be achieved in a few minutes with photoshop(I work at a tremendous rate personally, sigs usually take me 30 minutes to maybe 2 hours, sigs of the highest of quality). Art isn't rushed.