I think this is a very nice wallpaper but to me it looks unfinished. You can do so much more to it that ads a lot to the final piece. I know you are going for a more simple look, but add some more lighting to it, and add something in the back of the render. Right now, Simao doesn't look like he fits with his background. He's just floating in front of some clouds if you know what I mean. So add some more effects in his near background and some more lighting techniques. Also, the text for "Simao".. sample the color of his shirt and use that for the color because it is a bit more dull than the jersey color and so it looks a bit out of place. But keep working on it, it has great potential and it's really good already.
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Simao Sabrosa 
Linear Mode
