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I had some issues with this one, had to crop the render (which can be seen) and the clouds dind't end up good!!!!
Excellent realisation, i love it.
I am a french beginner with Terragen and i have tried to make the same image like you.
I am pleased with my clouds but i prefer your trees.
And i find my water surface have problems (squares) on the left foreground.
I don't know why.
That's the TGD:[attach=#]
I like the water the most here. The clouds need some definition/color variation to make them look right. Do you have more tree types? Mixing up various types would look more natural.
Keep working on this. It is a good start. 8)