Something you can do to make forest look more foresty is put those wide flat bushes far high in the sky above ground and camera so they cast moving leaf shadows on the ground, and fake a dense leafy forest even when there is no tree doing the actual shadow casting, as you can control the sun to perfection you can create a really tight connection between forest and shadows, giving player the illusing he is really in a forest, and not just walking through a path with forests at the side
Sounds odd at first, but creates really nice (and moving with the wind) shadow effect to split up wide open grass areas visually. And make them look less .. well, painted. Larian used this in a lot of places in Cyseal.
Anyhow.. just a silly little trick I figure may help make even more pretty terrain ;p Editor is really powerful when it comes to this, the amount of density of details you can produce when it comes to nature scenes is very nice, and creates very nice atmosphere
