If you're going to make buildings, here's what I would suggest:
Make several of them in different states of increasing awesomeness. (Like..."Archery Range 1," "Archery Range 2" and so on.) A large number of buildings in a consistent style, each in different stages of progression, is a huge need. And if you're going to use AI to make your art, then please try to do something like that with it.
These three little towers are cute, but I doubt they'll see much use because they would need to be in multiple "upgrade states" to be useful in a town, and multiple "damage states" to be useful in most other circumstances.
If you tossed out several dozen such buildings (archery range, barracks, defense tower, town hall, granary, larder, well, houses, alchemy center, church, school, etc etc), you'd be like unto kenny.