I just find its good to establish such to yourself as a developer going forward. Otherwise you might find yourself reluctant to do things that aren't "regional" "historically accurate" or "representative." I remember one person was making some kind of unicorn game and they kept asking me if they had to make all the unicorn horns the same size and I was like "It's literally your world. You get to make it however you want. I don't think there are any rules on fantasy creatures." But with that said, you're not making fantasy creatures so you will still need to follow some guidelines to be respectful and appropriate.
As far as resources go, no. I don't particularly know a good tileset for that. One of my favourite RPG resource artists is Avery and I consistently forget what great stuff she has put out. Just did a quick peach and saw some that could be useful. As far as using their work, read the terms. Some of the items have additional contributors but for the most part, they just want a copy of the game you make if you use her stuff.
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Also I'm still playing in MV, not sure if it was that you were looking for either:
Welcome to my MV resources! Here you can find a bit of everything, since I am a jack of all trades regarding resources :3 I hope you can find a use for some of them^^ What can you expect? Nightmare horses your heroes or antagonists can ride into battle, a full ship tileset, vehincle tiles...
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