well its ok you spend a lot time on this but it looks unnatural
just one little thing, compare the colours of all your trees with the picture or with ur imagination .... you ever seen something like this? i would say try to tint some trees try to use more variation maybe.
Also the height differences in your terrain and the picture given ... i would say it would be better if you use more height differences a bit like in the given pic.
Also you could try to use some archways in place of your roofs.
barring of this its a good terrain