I decided to continue improving the interface for cities, in particular, by creating a pack of building icons and enhancing them using a neural network. I have a mod that increases the size of the icons, and the basic ones look quite blurry, especially when compared to other interface elements.
In the end, it turned out quite well, but for the "Dungeon" city, there seems to be some kind of bug, and the icons are not displayed correctly (you can see this in the 7th screenshot), and sometimes other icons are displayed instead. Perhaps one of the respected modders can suggest how to fix this or improve the mod.
Link to the Mod