As per the comments about the sky, I'll take time now and then to photograph some sky images of my own (even with my iPhone if my camera isn't handy) to build a library of sky images to add to the Sky Replacement feature in Photoshop (I don't recommend using the ones included with Photoshop if only to avoid potential repetition).
Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.