Hey Joga.
Your Shadows are to dark. reduce them a bit to get an more brighter look. It doesnt fit to your Terrain because the terrain is much brighter as your model!

Also add Hard Edges to get an better shading.
The current shading looks really wrong.
How to?
Add an Modifier to your model in Blender (EdgeSplit) and export your Model again.

regards Sebastian

EDIT:
EdgeSplit Example:


Last edited by rvL_eXile; 05/02/12 09:40.
Tutorials:
[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains
CLICK HERE