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shirvanshah none of them would look typical anywhere IMO, but 2 can probably pass farther north (Sichuan/Chongqing ish) while the other two can probably only pass in Lingnan if at all

I have a slightly different opinion from yours, I think 1 looks more Sichuan/Chongqing-ish whereas 2 and 3 could probably pass in Lingnan.

1) I perceive as south-central China passing. I think the majority of Hmong can pass in Hunan/Hubei, Sichuan/Chongqing, etc. There are also some minority Henanese who can resemble her even

2) Has a basal face structure that is quite Tibeto-Burman (there is a certain nose/chin shape) but with some inland SEA influence and definitely passes in Sichuan as well as maybe even parts of Gansu/Shaanxi. Her makeup makes her look more Thai national though 
In some clips from a further distance/less filter distortion
her facial structure reminds me a bit of this Tibetan singer (https://www.youtube.com/watch?v=rcPgpuBB28Y). Tibeto-burman women seem to often have this lean jaw + forward pointing chin

3) Probably Lingnan passing, but I can't tell beyond that because her makeup/styling/vibe are so SEA shifted

In general I think that people sometimes underestimate how far north "Hmong" and certain SEA looks (especially SEA + Tibeto-Burman -> aren't "Sinitics" "northern Chinese" etc. at their base mostly Tibeto-Burman + various SEA?) can be found in China. Makeup/vibe throws things a bit off at times but without them + with equalized camera/video style I suspect that a greater amount would be seen as passing. 



This entire Akha family, if they changed their styling, imo could pass in northwest China/Shanxi with ease. Tibeto-Burman + Hmong/continental SEA blend faces are very common there

shirvanshah btw can this Henanese lawyer pass in Thailand at all? 
He's from Minquan county in northern Henan/near Shandong
chinachange.org/wp-content/uploads/2013/12/e8aeb8e5bf97e6b0b8.jpg
upload.wikimedia.org/wikipedia/commons/thumb/0/05/Xu_Zhiyong.JPG/1200px-Xu_Zhiyong.JPG

Among SE Asians, the general pattern is that Tibeto-Burman groups and Hmong-Mien groups tend to have more overlaps with East Asians especially Sinitic people, whereas Austronesian, Austroasiatic, and Tai-Kradai peoples tend to exhibit more overt SE Asian features and thus look more different from East Asians.

Can you see the fourth girl now?: www.facebook.com/akimxp.p/photos

Can sixth girl pass in the parts of Yunnan such as Xishuangbanna or among the Kra-Dai areas of Guangxi such as Zhuang, Gelao, Maonan?

Fifth girl-pass among both Han in those areas and ethnic minorities such as Tujia, Miao right? Pardon my ignorance, but are there differences in phenotypes between the Han (I know Han are very diverse and is more of a cultural than ethnic term) there and minorities? 

I would think so for sixth girl

Fourth girl imo also looks "Thai". Does not pass very far north up in China

Tujia look very similar to local SW Han, Miao are just Chinese Hmong. I think Miao can blend into Tujia and SW Han but have a slightly different range (rounder faces, less Tibeto-Burman looking than Han/Tujia)