Hello Scot !
I love that way to share project in initial stages, where you get input and ideas from friends.
For me different things :
I like the idea of the fountain being the center of your diorama, in order to keep attention focus on that. Most of your gi must be there. Why not making a priest celebrating a mess (even if it would have been made in a church in a non combat situation) or something where all the gi's are turned to the same point of attraction (musician, circus with bears etc..).
So th fountain should be central and the buildings should be distributed around such foutains, with at least two streets leading to the foutain, the buildings being at the corner/ angle of such streets. I would lokks like pie charts. I don't know if I make myself clear but I could make a drawing if needed.
Re buildings, I agree with Claude, The big white building could be cut into two. It attracts two much attention, and is two empty..I would suggest to apply the same architectural style to both buildings. I must say that I rarely have seen bow window in France, and of such tall, maybe one or two in Paris, but small compare to it. But I've seen loads of them in England and Germany. I second other opinion, the bow window seems to low.
I also like the idea of a café in a garden.
So to sum up I think I would place the foutain at the center of a round diorama, or at least half round dio, putting the figures concentrated in the center, with some others in the different corners. But that's just my feeling, and I hope it will help to build your story.
Best,
Julien