Just one more thing; a warning actually. I'm not necessarily saying it's a bad way to make an atmosphere, but if you're going to make things as stark and clear as you did in this picture, you should know that any mistakes or poor model choices stand out twice as much or more. I can see quite a few; like the tree choice, the placement of rocks I went over before, the 'fuzziness' of the grass compared to the sharpness of the trees and rocks, the lack of tree variation in certain areas (there are clumps of one kind of tree, then another clump of a different kind and so on rather than mixing them up), how the horizon line is lighter than the sky (usually bad/unrealistic), the fact that shrubs are clipping with the rocks in the foreground, the sketchy placement of the fences in the foreground, how just about everything seems to go in lines, and the list goes on.
To sum it up, this is your doodad placement now:
Mostly everything follows a pattern but there are a few scattered things every once in a while.
And this is perhaps what it should be like:
Things are scattered but there is still a little bit of patterns like what doodads tend to go near what other doodads and where, so it isn't totally random.
Sorry if those drawings are too abstract, they make a bit of sense to me