there is nothing unnatural in those pics (if it comes to environment and lighting of course)
This picture was made with a certain intension, to catch an "evening flair". It even looks like some kind of filter was attached to it after wards. But even without the whole scenery would look a lot different at another time of day, e.g. at noon.
This is imo perfect witcher atmosphere
Acutally I perceive the witcher world pretty much identical to our own world, with all its varieties and different moods. It's kind of weird to think that in a world based on realism and immersiveness there should be only ONE general mood and everyting should be dark and grim. I also don't see why the witcher world should be darker than our own world in general. That makes no sense to me. Again I guess that's a confusion of environments and narrative themes, in pretty much the same way many people seem to perceive the Middle Ages as dark and grim. It's just a psychological fallacy imho, our mind automatically connects environments to human problems. I mean, we even react to wheather symptoms, like being more happy when the sun is shining and being more sad when it's rainy or cold (at least that applies to a lot of people, not to all). But in all honesty, I don't think we should fall for that trope. The effect of dark themes in the narrative is imho even stronger if the world is just natural or even beautiful. Just imagine the contrast of having a great, warm sunny day with a whole palette of bright, summer colors while the abysses of the human (or elven, dwaren, monsterish,...) soul are still lurking everywhere. Hell, that's like real life!There's lots of beautiful and interesting pictures and paintings about how people perceive the witcher universe.