What are your plans for the hill in the far left corner? I envision some sort of stem plant bush there... possibility? A nice Rotala sp maybe?
The back left corner? I'm afraid there isn't much space there for a stem plant bush. Although you just gave me the idea of putting a stem plant bush in between the front rocks - to add more of a perspective style into it. Definitely a couple of possibilities I'll look into when the tank gets filled in and more developed.