>>3778484>identify atmosphere>identify feeling>use light and scenery to establish these photographically I'm only half serious there, but it's true that half of it is identifying the mood you feel. Choose what, specifically, in your surroundings best communicates that mood by itself. Represent that thing, then, using photographic methods at your disposal: exposure, composition/framing, theme, etc.
After that you refine until you're good at it. I'm probably not excellent at it