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I like all the cities, except maybe Inferno and Dungeon. Inferno reminds me of a ballistic missile silo, and it's just a pillar :( And Dungeon, because there's a piece of rock on the surface above a chasm, and it's held together by a small bridge :0, although they probably have antigravity crystals:)(the city itself is fine, it's just a shame that you can't see it in its entirety.
Academy is the most beautiful city: clouds, green parks, birds flying, I can almost see crowds of people in the markets, gremlins running around the city, golem guards:)
Orcs, the nomadic city is like a large caravan, a shed that was folded up and moved, and it generally fits.
Dwarves, it's solid as granite, although the lava lake in the center is a bit worrying.
Humans, it's a normal city, which isn't surprising;)
Necropolis is the second most beautiful, dark, gloomy, ominous:smile08
Sylvan, the tree is original, although it was in Disciples.
P.S. about flying cities, I've seen something like that somewhere, but I can't remember where.