As a comparison about the trees, second post, second image on this page :
http://www.checksix-forums.com/showt...157741&page=22
Most important thing for the trees is that they look real at the distances at which a pilot flying in an aircraft usually see them.
The implantation of the trees, each group to each other, is also very important for the general feeling of "being there".
P.S. I presume the colors palette for the British landscape is still WIP too ?