Photo #2, straight out of the camera, longer exposure. See the big difference exposure makes?
Photo #3, just a light touch of texture to the sky to darken the corners and make the sky a little more interesting...
And photo #4, heavier use of texture, almost starts to look a little like a painting.
Do you have a preference?? Not sure if I do. Photo-editing is a lot of fun, so I probably lean towards #4. Linking with Skwatch Friday. Click on the link to check out great skies from around the world. Thanks for stopping by, and have a great weekend!