Its not the face, subconsciously you take in to account.
I spent a year in Japan, when I returned to the UK, everyone thought I looked very Japanese, I bought the local clothes, had the local hair cuts.
Now that I have been in Singapore for a while everyone thinks I look Singaporean.
My elderly father was horrified when I collected him at the airport, in flip flops, shorts and T-shirt, My mother could not believe women go to the office in slippers!!
Took me a while to get over the fact you can be out eating in a decent city centre restaurant and can see your bare toes.
Its a combination of all the factors that make up the perception of the country of origin.
Its is only a perception an Asian friend studied in the States and came back with ther face painted like a cheer leader
, she looked so American.
Bit like you can tell an Eastern European a mile off in London