If I liked cats (which I don't) I might use that as a wall. It doesn't have a "snapshot" feel like a lot of them do. Was he laying in a sunny spot? It has nice directional light.
Even though I am a photographer, I don't usually upload photos here. We have a subscriber feature that will be available soon that will probably work out well for you. But, photo walls usually don't get accepted because they end up not being downloaded much. There aren't a lot of subjects that work well as photo walls, and a lot of photos are good "art" but don't actually make good "wallpaper".