Hi WL, A nice walkthrough for lighting useage.
I was curious as to why you didn't use a primitive set to 1 sided in order to maintain reflectivity and the walls' inner shadowing (pictures on the wall etc) of the cam-facing wall.
The added bemefits of this are superior lens usage in that we're not compressed into super wide focal lengths like 20m/m but , rather, can shoot long and maintain or even compress perspectives.
As we can see the shadow is useable though we cannot simplistically have a window in that wall even if there is a real window in the actual wall and we replace it with a wall decoy (as here) to simulate the lighting because 1 sided walls with transparentised areas leave messy edges visible from the shooting side of the cam-facing wall and take some degree of "play" to eradicate.
By shooting with a one sided wall system you keep the normal shadows and a normal environment. If I need a wall with a window I use lighting to simulate the window incoming light plane because transparentising leaves chronic edging that alpha cannot remove because that also removes the wall obstruction to light but regardless, it works.
Proabably an oversight. :)