After some design work, the tier 3 art style is finally coming together, and it informs the tier 1 and tier 2 styles in a way that makes me want to go back and re-visit them.
Stone and tile are fun materials to model and texture. I hope they'll be fun to acquire, process and utilize in-game, as well, because these high-tier structures require quite a bit of raw materials, not all of it easy to come by.