I see what you mean--I think you may have mispoken initially, then. To imply that the image has been 'photoshopped" implies that compositing has been done to place objects in the scene that were not present when the screenshot was taken--which, here, simply isn't the case. The car is quite obviously part of the scenery. At the very worst, you're talking about the possibility of higher-res texture assets than what may end up in the final game. That's the worst case scenario here. And, to be fair, I have seen sharper textures in other 360 games, so this isn't beyond the realm of possibility.