Looks kind of basic to me, however I don't think my first render was looking any better. So let's criticize;

1. The water needs som work, try mixing all the settings in the water dialog or follow a tutorial
2. The mountains are too pointy, also, some more snow would look better.

Try experimenting with stratas, and also try out the program "World-Machine"
Well, can't say it was bad for a first try, keep em coming