I wanted a smiling photograph of my daughter holding a birthday sign. Unfortunately, she was less than willing to give me a good one, so I superimposed her smiling head onto her body in a different photograph.
This is what I got:
What did I do?
I combined the photos into one document, Isolating the desired head using a mask. I then adjusted the coloring on the head and the body to match better, and added the appropriate shadowing from the new head.
*Photo courtesy of yours truly, Chana Cohen, July 8, 2013.