Big Sky Country, oil on panel, 6 x 12 inches

I'm attracted to the last sunlight on big clouds at the end of the day. The color of light on the clouds shifts from a warm white at the top to dull red-orange farther down. The base of the clouds merges with the general tone of the sky.

I explain this phenomenon in an earlier post Sunset Color Bands:
As the light passes nearer to the surface of the earth, more and more blue wavelengths are scattered out by fine particles of dust and by the air molecules themselves, with only the longer reddish wavelengths remaining. In other words, the light gets dimmer and redder as it approaches to the earth’s shadow line.
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Previously:
Sunset Color Bands
Fast Food and Big Boxes
The Golden Hour
More in my book: Color and Light: A Guide for the Realist Painter