I can change someone's face (from their photo) by another one. The final photo looks reel.
Replacing heads used to be the main reason people used Photoshop back in the 1990s, but somehow 20 years later people have gotten distracted by all sorts of other baloney and have forgotten the basics.
Replacing heads, or closed eyes or smiles, is a standard trick to take the best from several shots of the same group, and composite them into the best final image.
