I created kind of a similar topic here Does it bother you when there's different BG styles?
For me personally, I honestly don’t mind at all. I get that it can be difficult to find backgrounds of a certain style. Generally I would commission people to remain with a similar style, but after losing my job it is becoming difficult to still do that.
Also about the historical buildings…I mean they have a couple with the Eiffel tower in it so I don’t see why not, but I would suggest sending in a ticket just to make sure.