I’ve shown parts of the Fairy Kingdom made barren by having too much magic thrown at them during the magical wars. How do your characters cope with adverse conditions, adversity in general? Has the climate shaped your world in terms of geography, history, politics etc (in Britain’s case being an island has helped it in battle if only by getting us to be really good at seamanship)? What happens to those who damage, deliberately or otherwise, your world’s environment or does nobody care?
Have you got a mental image of what your world is like? I’ve based mine partly on Scotland (!), red rocky areas (Mars!) and part of it has rings around it (Saturn!!!). Magical attitudes to wildlife in my Fairy Kingdom are ambivalent - nobody’s that keen on dragons - but equally Eileen’s been keen to ensure harmless species aren’t wiped out because the sprites get hysterical. So what is the prevalent attitude in your world?
What is your environment like?
I find physical descriptions, particularly of places, hard to do so use my holiday snaps of various beautiful places in Scotland as an inspiration. And the great thing is I can leave out the midges! Think about how your fictional world is run. If someone asked you a question about it, could you answer them? Do you know enough about the climate, the history, the reason your world is run the way it is?
Classes
Consider life from the point of view of the ruling classes and of the “peasants”. Can make good comedy/tragedy but you can take the same event and get two differing but equally valid views. It can foreshadow troubles to come because of the differing perspectives. Equally that can explain why there are historical differences between say in my world’s case the ruling royals and the Witch’s family.