Thanks for the feedback guys. The house hasn't been textured yet, I thought I'd just throw it in and see what people said. I think it's too large, and needs to drop down a little.
I'm not sure about using a fill light on this one, I'd rather notch up the camera exposure to 3, which seemed to do the trick on a test I did last night.
I also think the moss has become a bit luminous, I think it needs to be darker.
Anyway, I'm now running out of time, and another TG project has become a priority with work, so one more render, and that will be that.