I think the night ambiance changes with moon phase, if you want realistic, though I would also imagine that might be a bit too much of a pain to have shifting lighting at night outside shifting with the moon phase.
That area in the balinoks with the copper is more fog than it is lighting, so might need to look at more there. I've also found that many, many places are actually pitch black, no matter the time, just take off your light items and find out.
I would say put a small candle or something in the vistani wagon for light, it's ungodly dark in it. I don't think the area needs a lighting change, just some small ambient light source.
The swamps near the village of barovia are incredibly dark and foggy too, even during the day. Maybe lighten it up a little during the day. Having been in actual swamps before I have never seen any thing that foggy or dark, and given barovia's climate I doubt it would be that humid in their form of a swamp. But just my two cents.