Great work, really like it.
Since you still have quite some time to go you could render this at the maximum allowed size and also with improved settings.
The shadows of the trees and the atmosphere in general in some places are still grainy.
I can easily imagine how smooth and supercrisp this image would look with increase atmo samples and higher overall quality settings like a tad more detail, AA and GI 2/4 or something.
What were your settings?