There are a few things you can do to change the sky in Photoshop. The first is to select the sky and then use the eyedropper tool to change the color. You can also use the Levels tool to adjust how bright or dark the sky is. The second thing you can do is to select a object and then use the Selection tool to drag it into position on top of the sky. Finally, you can use the Move tool to move objects around in the sky.
