Why not go here? http://forum.toribash.com/showthread.php?t=288975
What do you mean by realistic? I suggest find some real head to copy with like what others are doing. Copying Ironman's head.
You can also find some head textures from games like Warcraft III. You can edit them and do some artistic transformations, etc
which one? the textures from warcraft? Im not sure but i think it is legal as long as it is yours. But if its not yours its illegal to sell it esp when they are not really selling it.
yes you can. that idea just came in to my mind just that moment when i posted. i was once making models for warcraft a few months ago and there are head textures in there files.