Impressive work! A comment on the trees - I think much of the reason for flat looking trees is inadequately tuned shaders and sun effect. Trees tend to be noticeably darker than the surrounding land, but what you're seeing that's missing is how the sun can light them up. I've spent some time working on my own and in conjunction with Ankor to fine tune the shaders implementation to make the most of its capabilities. It isn't done yet, but when it is, I think the highlights will look out of place because they are static and always present, while everything is being lit dynamically.