Currently, the normal sky is just cloudy (like in the earlier renders above). This overcast impression is caused by a post-pro exposure increase for better view of the bridge.
That doesn't mean it isn't intended in the upload here of course.
I have used overcast skies in my Ireland project, and I think I will change to it in next versions of this scene as well.
I have always intended to experiment more with overcast skies, because I live in Holland, and we have a lot of clouds casting over so to speak.
I'm currently rendering a 1024x786 version of the last upload with improved terrain detail.
That will showoff the bridge better.
Then I intend to create a path through to forest that ends in a clearing.
I want to place a hut in that clearing, but I'm not sure I'm going to make it myself, or try to find something on the internet...