DZVONKO PETROVSKI, LIGHT STALKING:
"Composite images, if they are realistic enough, require some trickery to be created properly. It requires both photographing and post-processing skills in order to do it right. However, the skill you’ll need in post-processing is, in this case, of far greater importance than the skill required for taking the photos themselves."
Read part one, here.
And part two, here.