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So if replacing the sky sounds like cheating, is it OK to enhance the image so the sky changes from whispy clouds to dark and dramatic?
It is OK to replace/enhance or do whatever as soon as it looks GOOD and artistic. After all, in a past, the painters were not taking snapshots of the landscapes. They were painstakingly sketching, and memorizing, and omitting insignificant details, and it took quite a few days, so none of the landscapes of the past centuries we are admiring now is an exact snapshot of the reality. However, if the painter drew glowing red sky with the river surface reflecting gray clouds, how would you call him? surrealist?