Before I saw this terrain, I had no idea that that many different kinds of doodads could me crammed into one terrain. Boy, was I wrong. When people say "variation" they don't mean cram in everything in the environment menu that vaguely fits the theme.
Maybe you should stick to only a few kinds of shrub, two or three kinds of flower, and three or four trees. That way it looks more like a natural forest. And another tip, although it may not be totally realistic, it looks better to make the density of the forest thinner where the camera is pointing, and thicker where it isn't.