Diablo Alpenglow
After sunset following a winter storm, a snow-capped Mt Diablo is bathed in Alpenglow as the dark blue shadow of the earth rises into the evening sky. This phenomena occurs about 20 minutes after sunset when the air is extremely dry and clear. A long exposure shows movement in the clouds and foreground trees.
Canon EOS 5D, f/22 @ 73 mm, 13s, ISO 50, No Flash
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While your observations are technically correct, this was taken after sunset and there are no shadows and the sky was really that unreal color. and it cast that unusual diffused glow over the landscape. This was meant to be a surreal and unusually composed scene instead of a common scene with classic light. Based on your comments, I've succeeded!
Suggestion: A tighter crop from the lower skirts of the hills and a little from the right would do the composition and viewer a great favor. Needless to mention dodging and burning with curves> or layers >and blending modes in Ps. Ultra-wide angle lenses sometimes can be quite tempting to include more than needed in a composition, unless you have a very compelling/interesting foreground and background