I think, this is a very beautiful picture.. Im really impressed by the water you have made, it fits beautifuly with the almost virginal green grass area..
I think its easy as the viewer of this picture, to imagine how this place would be in real life.. But something I would miss if I were standing on this beautiful island (as I imagine it is) - is some bigger clouds.. It's hard for me to explain what I miss about the clouds since im not good at Terragen..
But I enjoyed your picture, thumps up..
Cheers,
Mike