Things that are near tend to be darker with more detail, distant objects are usually lighter and more blue.
This happens because the atmosphere filters out yellow light, thus green hills often look blue. Van Gogh frequently emphasized this phenomenon. I was thinking of some of the paintings of his that I saw in Arles and Saint Remy when I did this one.
Again, thank you for the positive comments on these tips, and thanks to the sketch a follower sent, I love to see what you are working on.
So keep on traveling and capturing the moments.
theTravelsketcher 
So cooler tones for backgrounds and warmer for the foreground?
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In general, yes. Though since I usually prefer cooler shades I can just darken and do detail in foreground. Thanks so much.
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That’s good to know and will help me in Photography too!
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Yep!
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I literally thought this was a photograph….Beautiful!
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Thanks so much
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Wait… After reading Shirley’s comment, I went back up to the first image. That’s not a photo?!? Wow. Well done. Beautiful.
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Nope not a photo, thanks.
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