It's really great work... I really like the story the map is telling, especially because of the wall... and of course what you imagine is behind it!
I like to "walk" in a city with this kind of map, but what I often miss is the complement provided by the relief information. I like to know if the city is perched high up, if the old city is on top of a hill....
Obviously, I understand that this is not easy to add, on a plan like this