I know how to do long exposure, but sometimes, quite often in fact, the end result does not look as good as I wish, in terms of patterns.
An alternative would be replacing the sky, but I'm asking if it possible to create it from scratch. Assuming I'd like to create those very long exposure textures on the sky (essentially stripes of clouds like this), are there techniques (based on brushes?) to achieve that?
Essentially I want stripes of clouds like the image above. I searched online, but I could not find anything.