I'd use the small bushes then. Also, at that angle of slope, I doubt you'd see grasses like that.
One thing I encourage you to do from a map design standpoint, is to think about playability and how maps should look from a video game's point of view. So, the super steep mountain sides from reality aren't so good for an RTS game. Think about using "cliffs" as map features instead of mountains, and to add dimensionality, try some nice rolling hills.