Because someone took this background from the online library? ^.=.^ But, I think that easy to explain it from the point of view of a game. Human figure on the sign, why not? Humans became a part of their culture and folklore and why they should not draw people on various signs, mascots and pictures? Presence of the bus will be more difficult to explain Let me think...

Dragons don't use stairs that much, either. Yet the houses have them.

Well, if you want to know why: the free resources used as many of the bgs in AwSW were (as urban landscapes and buildings usually tend to be) made with a typical human civilization in mind. Radical Phi had to cut some corners to deliver a VN of the scope they did with what resources (money / personnel) they had available.

I imagine if they were a larger company with plenty of permanent personnel, it'd make more sense to iron out discrepancies like these that, for most players, don't affect the experience much. As things stands, though, they're small enough (both the company and the discrepancies) that the work that'd go into it is probably better invested in creating more novel gameplay.

Of course, I understand that, I just like pointing stuff out like this. ^^

But before Reza and you arrive in their world, dragons didn't know WHAT an actual human looked like. I have my doubts someone simply chose to add a figure to their sign days after Reza arrived. It's just a free background image taken from somewhere online.

they use assets from other things https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1250765107 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1250767683

and if you look at the window of the cafe, the window says "Uncle Mugan" thats who made most of the free assets in the game.
check this out for more information: https://steamhost.cn/steamcommunity_com/workshop/discussions/18446744073709551615/1470841715962458556/?appid=571880