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I really like both of these, Tuan.
Funny about how people interpret things so differently. For example, I prefer the first image BECAUSE of the contrast. Mind you, I'm a documentary shooter and tend not to view images from an "artistic" angle as much as I do from a story-telling angle.
The sun is shining on all that foreground sand, and the image shows us that. But the background mountains are dark and stormy, and the image also shows us that they are.
This is to me a perfect story-telling image about the suddenly changing weather found in our southwest deserts.
If the sand were over-exposed, that would be different. But it's not; it's just right.
Just my $.02 of course .