PCC: you SS was rejected for the reasons cited above. You need to place a window, or an opened program, something, partially obscuring the wallpaper. The idea is that somebody couldn't just save the image and restore the wallpaper with just 5 minutes work in Photoshop.  Hide half his face or his body.
If you just want to spread the humour, then just give a link to where you got it from. If people want the wall, they an download it from its original source.