Ok, so overall it's nice.
Only that I find a little bit of effects lack.
Why do I say that?
Well, what I would've done, first, is center the idea on Deidara, making him the central point of the sig, bringing him in the front.
Meaning, somewhere in the back, I would've made a light focal. So in this way you shoot the missing of a good light and the lack of a central point in your sig therefore, it covers the lacks in depth.
How do I do that depth?
Well, as I've seen on Elmage (he helped me as well) and on the other tuts I've visualised over time, I create a light source first, put the render/stock so it fits my needs.
If it's render, I delete the margins so it would not seem from the outside, if it's stock, I blend it around with the blending options OR I delete the areas I don't need in such a manner that you won't notice the difference between the background and the render/stock.
As well, what I use sometimes, the render/stock itself.
Duplicate it 2/3 times, smudge it, blend it around and then add the render/stock.
Being the same color pattern you will get away of this problem of the render/stock not matching with the background.
After I do that, I darken with the burn tool around the margins and add a little extra lightening effect with the dodge tool and in the end I sharpen.
So basically, you got yourself a sig that won't lack in depth, effects and such matters.

Hope I was helpful enough.
