The first one is the best only because the render already has a desaturated feel to it.
It's not bad but this is a completely different style than your last few. One main thing that I notice in this piece is the lack of flow. You're render seems like it's just kind of placed there.
For the most part I can point out a few reasons why your piece has that sort of effect. For one your have two vertical lines on opposite sides of the render which run almost parallel to each other. In addition to that you also have horizontal smudge lines running across the background. And finally you have a second focus point. All of these things running together really through off the flow of your piece and my eyes are running all over the place when I look at it.
Other than that not bad, glad to see you considered placement and the absence of text. The boarders are a bit thick but I do believe they are necessary for this piece.
its better than the other one though imo the background is too blurred for me and instead of creating depth makes it LQ the borders surprisingly don't ruin it i think the size is good i like the first one in the others the colors don't really look that good but in that one the black and white actually goes well instead of just being a last resort to make it look a bit better with a simple B&W Adj. Layer but besides that i think that the background really ruins it as well as the creatures face creates a second focal that takes away from the original Naruto render