Naruto

http://i50.tinypic.com/t854m1.jpg
This i s my fav.... please comment :D

It's nice enough. The colours work well, but imo if one is going to do an anime dude-in-the-middle one should make an anime pretty filter background to give the thing some uniformity!

If you're going to make a background from some other texture or the render itself make sure it flows well, which is something your sig lacks.

Most of the problems with anime sigs is that they're either
a)too bright
b)the colors are too contrasted

Balance them out more with a hue/saturation fix.

It's not bad, but the render could use some blending and the splatter brush seems a little out of place in my opinion.