Every model is made with my own hands. No model assets from others used. I used Archipack and Building Tools addons for creating the room and building. All textures are CC0.
Final render. 5120 samples, 3 hours of rendering in Cycles.
Overall scene outside.
Overall scene inside.
Topology.
Paper material node system, the most complicated one. All others materials are basic PBR or non-PBR setup.