Too blurry. Only thing that isnt blurry is the text. Its kinda boring, it has very little variation between different regions of the sig, no real effects, other than the down to the right movement, blurriness, and what looks like a duplicate layer over top set to linear dodge. You badly cut out the top of the guy's helmet, there is a hard line on the top of it. Oh ya, and I recommend trying out some tuts.
Ok, then Too light, needs more contrast. Too blurry still. If the problem is the render, then try not working with really LQ renders. Oversharpening is VERY BAD. You have to watch it when using the sharpen tool. Whatever the effects on the side are, I don't like them. The BG really is boring, very monotonous. Did you make this for someone? If so you should have requested a higher quality render. I ask because you say it isn't your render. Oh and if you didn't already know this; when I give CnC, I am a bit cruel , I always point out everything that I can find is bad, and never say anything good.
I say take the first render and put it back in the front, then duplicate it, And go to filters/blur/motion blur. Then change the settings soo the blur comes to the side of him. It gives it a more of a Running/action image