Yeah old blaggard said it very well...I agree. The grasses and sky look pretty.
I also like the texture on the rocks. Maybe it's nice to try to add a little little more bump on it. Maybe you already know how to do this, but I'll explain it shortly
maybe useful for other readers/users.
Create a powerfractal V3 (pV3) and connect it to the surface shader of your fake stones (shader input in the middle). Go to the pV3 settings.
Setting ranges which work fine for me most of the times are:
Feature Scale: 0,005 - 0,02
Lead in scale: 0,05 - 0,2
Smallest scale: 0,0005 - 0,002
Displacement: 0,05 - 0,15
As said these are ranges and of course you should have to tinker a bit with them
these settings work fine for me in most of the cases, if you have questions feel free to ask.
Martin