Okay, the background is okay, but isn't so flowy. It goes in all different directions, but still it's nice to look at. But the color of the render and the color of the background aren't working so well, and the render isn't blended in at all. Using opposite colors work nicely, or some similar colors from the render. As for blending....I don't know how to explain that so well. The text is.....out there. And it seems to bright for this kind of tag. I mean, the render is dark, the background gets brighter, then the text is white. Another thing about text is matching it as well XD Hope that helped.
I say the sig should of been darker. Useing white text doesn't look too evil. :/ Also you should of made the person bigger to fill the backgrond more.