Such a small visualization of a personal idea.
I would change a lot, but it’s over.
I would ask for constructive criticism. 
Overall it’s very nice;) rocks seems a little bit too flat, you can add some more detail using didplacement or sculpting, also try to scatter real 3d moss. Another thing, most shaders lack reflection, maybe adding some wet look to the rocks and foliage will improve the image.
Thank you for the advice.
The flatness of rocks is intentional. It is through lighting caused by fog and clouds that scatters the light. But you’re right, maybe it’s too flat.
When the rocks had more reflections, they seemed plastic to me, but I may be wrong.
Here, every rock element has displacement, maybe it is too weak or I did somethimg wrong. And indeed, maybe sculpting and more vegetation could improve whole apperance.
Nice Detail that your Avatar is the dartboard on the rocks 