Like the effects you used and the lighting in the bottom left corner. Nice render that you used. Try filling up some of the dark space over on the right-hand side with an effect or two, it looks a little bland. Other than that, it's a nice tag. :3
The usage of bright and solid colours in most of the signature gives it a very nice aesthetic. The slight cartoonish effect of the render despite the realistics of the source suits it quite well. The only slight drawback I see is the darkened colour of the right side, it does seem to contrast with the rest of the signature's solid bright colours. The lighting is used in good effect. Quite good.
