Right, as you already pointed out, body language is a cultural thing. I'm not Asian nor do I know Asians so I don't know about their body language. But I watched a lot of anime when I was a kid
so yeah I think the Asian girl's body language is really reserved. Did you know that in some Asian cultures it is even considered not polite to look into someones eyes at all.(except for family, close friends and spouses)
I'd say study Asian body language a bit by watching romantic movies from that culture and read the body language. It might be fake on the screen(and everyone that has learned to speak body
will see that it is) but you'll get a basic idea about the "cultural" body language.
Good luck brother.