@ Pibuz: Yes, I did use external maps. Worked perfectly. I'm very happy with this feature. Try it!
@ CTZn: Thanks. The final version won't look all that different from this one, I think. The walls texture needs work, though. Now it looks not nearly subtle enough.
@ Ono: 1.1.15 is for wussies, everybody knows that.

I get that quite alot, "too dark". In my opinion, lots of archviz is waaaay too bright. I'm right, the rest of the world is wrong.
Oh, got a question for you hip youngsters. Suppose I use pure white for the walls, will this merely result in excessively long render times (that I can live with), or will it also cause fireflies (that I cannot live with)?
Have a nice weekend, y'all.