I think he mean the fog, you need to zoom wider in the world editor using the mousweehl and strg.
The "hills" doesnt look good, they look so random placed without any thoughs. Maybe it was intented that it looks like this, but i dont like it.
Also i think this sand+ud ground looks horrible, dont use those tiles together that wont work out.
Also this looks more like a freaky outer space screen then a Dark Dalaran Terrain. Where are the ruins? Or the City?
Any relics or something, a base camp...
Gah i cant give contructive Critice, i would go and make this whole thing new sorry to sound harsh.