It's just something in the nose/mouth area to me that I feel resembles them. The hair style kind have that vibe too but it's something about the long (i dont know the right way to describe that lol) nose with the kinda droopy looking eyes i feel like i could decipher a real life human face with those features. but idk like i said that was a personal opinion , I still think the art work is extremely beautiful. Enough that its borderline realism to me , coming from an artist myself. Thanks for the rec also! Also just responded to you cause you had the longest reply, no particular reason or anything haha.
I dont know if it's a coincidence or if I am the only one who thinks this but from the start, I really think the all the characters in this have features that resemble Taehyung/V from BTS. I don't know if the author meant to do that or took inspiration from him but if they did, they were spot on! But that's just me, anyone agree?