I was asked about how the Maxfield Parrish colors were done in one of my Mt. Belcher renders.
(This is rather lurid and non-photoreal stuff so let me say the obvious easy way to get this effect is simply adjust the saturation of the finished render in your favorite image editor )
In my render I used two atmospheres, a primary one for the cobalt blue tints for the sky and a secondary one with normal Tweaks section to use standard red sky decay and plenty of oranges in the terrain.
This example TGD also uses a blue no shadow sun opposite the shadow casting white sun. Adds a bit of blue to the shadow side of things that Parrish often used.
Cool, when my current render finishes I'm gonna give this a try. Thanks very much.