And I shall not stop following that improvement!! 
Keep on keeping on… 
I have one comment (if you don’t mind) about the (windows glass material)… In the last image (the sunrise one) I agree to make it transparent, because the indoor lights are stronger than outside one…
But (at day time) when the sun comes up, the window glass would be reflective more than transparent (concerning with your camera position); so it acts like a mirror… for that I suggest to change that material for the daylight images…
My Best wishes