Quote: "It is realistic when you place lights exactly as you would find them in the real world"
Placing the lights in a realistic manner, doesn't mean, that the end result looks realistic, too - as can be seen with the pitch black ceiling, which is continuously appearing in FPSC games.
I've only 'stepped in' and added my remark, since you never talked about illuminating the ceiling as well, but said, that the new lighting looks more realistic, when, in my opinion
, it absolutely does not - since no lights were added to lighten up the ceiling, compared to the rather nicely visible ceiling in the first post - and you didn't suggest it, but left with a "looks more realistic already".
But back to topic.
PekelaarSFX, the scene looks pretty solid already, but I'd suggest to use a different ceiling, since, for the most part, it doesn't look too nice, when the ceiling and floor share the same texture; that way, the overall scene often looks more repetitive and monotonous.
The last room could look better, when you'd raise the ceiling from 1 segment to about 1.5 segments, since it would flow better with the wider room layout, that way, you'd also have more space to add details to the ceiling, etc.
Keep it up!