Here is another image I made of my friend's new bathroom I create in style of 50's. There is no trick here. It's a combination of IPR and indirect light... I am happy that it is really possible to create very photorealistic pictures here with 1.3.1 renderer...
settings here...
GI path
DB 1
algorythm IPR
picture size 6000x4000px then resized to 1000x667px
time rendering 13 hours 30 minutes