O HAI THAR
Overall this is probably one of your best, but the coloring is off IMO.
Maybe make the renders skin purplish, and change the color of the text because it doesn't flow.
This is terrible, scrap it. lol :P
In all seriousness, i like the render effects and text, although i think you should use a use a color on it. The lighting is decent. The cloud could of been incorporated into the signature better, but it doesn't look bad. My main complaint with this signature...