Well... As Oziris said, Blizzard Cliffs aren't so good, because they look unnatural. Nice start. the problem is that the terrain is so... "Warcrafty". I don't know if you already noticed that the warcraft's trees size, how the trees looks like, and etc, isn't natural. You could add a fog to your map. And remember, do not use blizzard cliffs. Keep trying!!