For images that already have a sky, you can use the clone stamp tool to copy and paste parts of the sky from another image, or use a gradient map to add a gradient effect. If you’re starting with a blank canvas, you can simply paint in your sky with the brush tool. There are a few different ways to approach this, depending on the type of image you’re working with.
Adding a realistic sky to an image in Photoshop can be tricky, but with a few tips and tricks, it can be done relatively easily.