Well thats basicly what i said, about having the same assets and making the same scene/game.
And no, your terrain looks small. If it's suppose to look bigger, maybe less water or a different scale of textures would have helped.
btw, i'm yet to see any great looking terrains from unity, it all seems to just be painted texture, i dont recall every seeing normal mapping or specular but as said its more about the art direction that the complexity of a single element
Just to name one:
