Thank you! Those interior renders are quite difficult sometimes. I usually use the same HDRI I use for the exterior shots as well and increase the world strength a lot. For windows I use a fully transparent shader and put in a light portal to reduce noise. Then I just rotate the world to align the light where I want.
Often I end up using large area lamps to mimic the sun and that also helps with the noise. To be honest getting enough light and managing the noise is a bit of a challenge for me. For the renaissance cathedral build I did a while ago I just removed one wall entirely and that way got the lighting I was looking for xD. Then just a bunch of photoshopping.

Thank you! I really don´t know how much time in total I used to build this. I started it quite a long time ago and just built it every now and then until I decided it was done.

Thanks! I hope I get to properly finish this rather sooner than later