My theory is that when a modeler decides not to skimp on the foliage, the scenes and the entire layout benefit, in my opinion. Foliage imbues unity, when emplaced carefully, reinforced by going out into the world on little excursions and looking carefully.
Driving along Interstate highways (nearly drifting off roadways onto shoulders in the process, a couple of times!) I observed areas about which I thought I knew the details present, but looking carefully taught me, for example, about all the low foliage and the visible ground that populates the edges of a woods/forest, and how it actually does present itself.
The effect on me of such scrutinizing and re-working many of my scenes has paid-off with a further sense of believability, at least in my viewpoint, for scenes I have chosen to very carefully craft and re-do, more than once.
The many products available from Scenic Express further inspire me because once I have them in my hands, their appearances give me new ideas I did not have previous to first imagining a particular scene, so I just "go-with-the-flow" and let my imagination and memories of actual scenes, like these along Brake Hill Rd. near Homer, NY direct my hands.
FrankM