basically the same world as my last post, some modifications... hopefully this is an improvement!
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The grass and trees look good, the composition works, not sure about the number of boulders though. Possibly keep them more to the edge of the tree line, or clump them up using a paint shader. I'd like to see this with a little more detail on the render to see how the tree models stand out. Maybe paint around the edges of the boulders for a taller grass population.
I left a comment on your deviantart page for this one.
From the small thumbnail version I thought those rocks were haystacks. Maybe another option?
Very nice. A suggestion - add a Reflection Shader at the end of your fake stone's shader and remove the Ray Trace reflections (for rendering time; otherwise leave it). Then scaled the reflection down a bit with the refraction settings. This image is very good and little touch like that will help its realism.