I expect to see shadows from the grille and curtain on the floor, but there are none. Can you tell me how that works?
Filling the interiors is great, it's a lot of work. Do you model the filling yourself?
When I was experimenting with the windows glass I turned off shadows for the whole window and curtains and then I apparently forgot to turn the shadows back on and never noticed. Awesome observation. Thank you very much.


(before and after enabling the shadows)
No, I don't model the room filling myself.
There are few exceptions for some simple things (like the posters, shelves, bed blankets, etc.) which I do make myself but most of the models I use for the rooms are from DAZ Store. Although sometimes they need some fixing like removing double faces/vertices, fixing UVs, reducing the vertex density, etc...
Textures are not mine as well, although I try to downscale and/or channel pack the textures whenever I can to boost the performance.
But for 90% of the models I have to make a whole new material because usually either the DAZ->Blender importer I use doesn't import the materials properly or they're just setup non-optimally to begin with.
So in the end, even when I'm not making the room filling models myself, there's always still plenty of work I have to do on them myself to make them work without freezing my PC on every render.