@eishiya thank you! I've studied a lot of other artists works with color picker to indicate an approximate range of colors and saturation/brightness levels that people use. Also I realized that people like when you use mixed colors. Green+blue/orange and etc, it's like a chocolate with salty crackers :)

And yeah, dark zone is pretty big but I didn't find another way to show depth in formation. I used lighter shadows on smaller rocks cuz they are pretty round and "classic"