Lets see here:
1. The grass is dark and the water is bright, how come? make the grass lighter and the rest.
2.Those rocks look really bad and why are there only rocks on the left side of the terrain? add them in the far distance, but only smaller.
3. The sky should be bright! if you want it to be more realistic.
4.The tiles is boring, add more dirt.
5.The fence looks really out of placed, there are placed wrong in other words, and what are they doing there anyway? show us a house of the tauren or something else.
6.Add some glow doodads, it will be better.
7.The fog looks bad, change it into some brighter fog.