Ok here's an update of the image, fixed the annoying node materials a little and modelled some little details here and there (mostly door and stuff like that...)
I like it better in every aspect... Rendertime was 1 hour, This is no rescaled size of the image (added the black outlines)
You really gotta love the Kray! It's relatively easy to setup good looking lights...
I'm just learning to setup and tweak stuff in Kray, so it's quite basic settings I used for that image...
I'll prolly try out doing night time image also with only inside lights on (I love the fact you can actually light scenes up with just luminous surfaces very well, which you cannot do in other renderers in LW that well)