RobL wrote:
Any image which purports to be a description such as a landscape should never ever have sky replacements. I once pasted a deer into a rural scene, two images from the same location taken a while apart; it worked, no one could tell it was fake, but I binned it as I knew it was fake. Model and product shoots are another matter. As a photographer would you be truly satisfied with fakery just to win some crummy contest? In competitions that matter you would be disqualified. Anyhow with fake skies the lighting on the ground rarely matches the new sky, shadows, light direction and colour temperature are all wrong. Work with what you have, fine, but photoshop trickery is no longer photography.