I have to agree with everything that's been said: I love the almost watercolor-like style, but it is hard to pick out that those are cities. You have chosen a golden yellow to represent the other urbations, why not use it in the city too and show the divided nature some other way? Or just add some crosshatched lines to show streets?

I just think you have to make it more obvious that those are cities. otherwise (especially as I don't speak the language) i just can't tell intuitively what the blue and green patches are.