looking good...I agree with the others..grass...there should be mounds of soil too...and the water...could it be possible for the map to simulate water current running towards the sea wall?....i think it's just me(regarding water current)...but...this is really good...and more feasible to construct, if someone would ask me from an architect's point of view.
Good that you utilized skylight..for natural lighting, so, I think you also have out watch out for that in the render..
Keep it up....