First I thought, there is too much red in the sand?
At least it feels like that... and sometimes I may be right, sometimes I maybe wrong?
-> Well it's your desert, so you must decide. But maybe I can help you a little bit here?
I searched my photos and found a nice reference color shot which I made 2011 on a flight to Hong Kong over the Mongolian desert.
The colors are quite exactly what you see in reality. Sometimes they are more yellow, sometimes more red, but the reference image is a good interpretation of the whole color palette there.
Color Palette in the Mongolian Desert
The trees look somehow strange because of the fading into the sand.
Is it some sort of dust, wind of wandering dunes?
By the way, I experienced the same effect when working on my Pteranodon scene.
I had quite some problems to solve when I rendered the fog and clouds into the scene, and trees are beneath the fog and cloud layer.
Some has rendered whitish, others are rendered as expected? A very mysterious behavior of TG?
Pteranodon Hunter 2023
Strange cloud-fog effect?
Overall very cool to use water shaders for sand formations, you're full of surprises Ulco!
Here are my 2 cents...
I personally would prefer a more yellow colored dune field. For my taste, it's too much red.
Some trees are to white-bluish at the left border and the lower left corner.
I would replace them with some sort of a darker more saturated green, they would fit more into the rest of the vegetation.
Same for the sky at the horizon, it looks very flat and desaturated, maybe a little bit more blue...
But the whole scene looks good, you can really feel the sand between your teeth...
STORMLORD