Kudos for doing a project on such a grand scale, the road and dirt on the sides look especially good. But sorry to say, the rocks/ mountains kill this one. It looks like what it is, painted spray insulation. It should look like rock. I would imagine you could spray the foam out like that, and carce out the excess afterward for a more realistic appearance. Try a little bit of grass on the road itself as well. Weeds are tough little things, and have been known to pop up all over.
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