The scale is too small, it reads almost as noise.

If you could also make the rocks separate (move to the sides) as the player gets closer to the ground...that could enhance the depth effect.

I think the trees are better off darker than the grass, also the sand is quite pink.

Please, please, immediately stop keeping to imply that it is not clear what you are talking about.

So you actually think that I took precious time, not to clarify an issue where I perceived you to be a bit off, but just to belittle you!?

Ok, I won't bother you with any more insights and let you get back to your rectangles...

Note that the clothes in the background are black (darker RGB than the dress) and in apparantly more light than the dress. The soft shadows on dress indicates it is not lit by any strong light (but maybe very yellow). Anyways, the picture (RGB-values) shows a goldish-brown and whitish-blue dress regardless of what produced the result. And there doesn't seem to be anything substantial in the image to offset that color-perception.
But yeah, I would like to know how anyone can perceive this as black & blue.  Maybe it has something to do with monitor brightness/contrast? Viewed a bit darker or with higher contrast it may appear more blue/black. And then you have a potential problem with common people playing quick and loose with color-terminology. Let's find a few blue-blackers and test them!