Looking really great Frank!
I'd like to share 2 sugestions though:
The tree in the very foreground is obstructing the view, it's too much "in your face". I'd mask that specific instance out with a distance shader for example.
The procedural grasses look very good, however, in the foreground I'd still replace them with models as it is too obvious procedural there.
Else I think it is really good and I'm looking forward to see your own suggestions incorporated (as well).
Cheers,
Martin