I just went outside (in my pajamas because it is my relaxing Sunday morning here) with my Nikon D90 and my 300mm lens. The lens gives a very narrow field of view. I set the camera fully in manual so there would be no changes to color, contrast, or exposure. All shots were as "neutral" as the camera can go, and identical parameters were used for each.

Note that nobody would publish a sky with these colors in a "finished" artwork, because this is real color, not enhanced over-saturated polarized looks the way people want in phtotos.

Choose whichever you want to make your gradients.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)