I like it a lot. I think the branch rock give you a nice theme; different from most tanks.
With time it's going to blend in to your surroundings; not to mention you will re-do your tank many times over.
I'd try to conceal the heater as much as possible, but thats just me. Other than that you tank is comming out nicely.
Where did you get your live sand, looks really white and smooth....?
Mike