If you dont mind my coments then I would like to add something as well:

Some edges have sharp shadow transitions. Some smoothing in the shadow baker could help to overcome this. It is obvious on tree-trunks and on the walls.

I also would like to have more contrasty lighting but then you need a more bright sky. For your grayish, cloudy sky your lighting setup is perfectly right. So it just depends on the mood you want to achieve.

Wish you much success with this promising project.