SUCCESSFUL SKY REPLACEMENT
When you want a convincing alternative sky, there’s more to it than running the image through the Sky Replacement Tool
Sky replacement in Photoshop has become so easy that anybody can do it in a few seconds ( just go to Edit > Sky Replacement, choose a new sky, and experiment with settings). The real skill lies in choosing the right sky, then positioning it so that it looks natural (you can drag the sky to move it around within the command, and alter the scale to resize it). There are so many examples out there of terrible sky replacement – and, unless you want your landscape to join those ranks, you need to take care over the details.