First attempt on the "mound" around the fort. I've basically done the opposite of what I'd do with shadows. i.e. a layer with some graded white over the top of the grass, semi-transparent....

What do you think? how would you make this better?

Click image for larger version. 

Name:	Garrison Ground Floor.jpg 
Views:	185 
Size:	1.32 MB 
ID:	21410