No no I totally understand what you meanIt looks pretty good, but I'm not a real fan of the whole design. It just doesn't seem anywhere near blended enough when jumping from your stock photo of Nexus to the brushing at the bottom and top. The main PSD is blended a lot better, even if I think the brushing on his left shoulder (right from our view to clear up any confusion) sticks out a bit too much. I'm not too sure about the placement of the logo/text either. It just seems a bit random since there's all that space at the bottom too. I would have thought you could have maybe had the Nexus quote at the bottom to give the wallpaper more of a full feel.
With all of that said, I'm a total nub at GFX and haven't done anything in a long, long time, so you can probably take anything I've said with a grain of salt.