bagginsbill time ago I made a very similar question and thanks to your answers, I learned to use GC, Skin shader and IDL

illuminate an interior room as the picture I posted, is something that still can not get and I just can not understand what is the right way.

I think i need a deeper aid

Poser Pro 2014 SR 1 on Windows 7 64 bit
I use IDL, Gamma Correction and EZSkin for all final renders.