Your tweaks on saturation did a nice job, but there is still (imho) a lot to do. You still have several objects that mostly catch the light on their very edge (the stone, the bushes), and make them look fairly flat.
The rocks in the dirt use pillow shading, which makes their shape quite undefined. I think you can do better with the colors you have picked there.
Possibly, what troubles me the most is the shapes you use for mountains. They look made of bumps as the bunch of leaves used on the tree, while mountains would more likely be curved in the other direction (inwards).
Hope it will help.