adobe photoshop - How to slightly rotate my photography images with a little twist of 3d perspective?

How could I slightly rotate a photography thumbnail like this? (e.g. first web videogamer.com):

How and how much should I rotate the photography to change the perspective in a slightly 3D way? Is there a tutorial I could follow to make it correctly, so it looks nice and not "As-I-think"? I will appreciate it, thanks.