There is a site skins.be. Here people get Very Very High Resolution Photos of celebrities. However they do not mention their source or anything like that. There is a USer upload section too. There is no water mark on the pictures. I want to know that if anybody will use their photos to make wallpapers by adding his/her own artwork then will it be legal? Is using photos of superior pics forum for creating artistic wallpapers legal?
It's not legal to make derivative works from someone's copyrighted material without either their permission or a license stating you're allowed to do that. Get their permission if you want it to be legal (but chances are very good the site doesn't own the legal right to grant you permission anyway, as copyright generally belongs to the actual photographer in each case unless they've been contracted to give up those rights.