most PRC girls wouldn't want their pics to be seen online..
especially those young PRC girls..
they have the mentality of "i just doing this for quick $$$, i'm out of this profession in 6 months' time!"
of course, 99% of them never get out.
i usually say i keep the photos for easy future reference.
that's why i need a face photo + their number tag... this usually can net a full body head-to-toe photo shot.
if you intend to tip, then tip before asking for the photo.
if you don't intend to tip, then ask for photo first.
for non-PRC girls.. (especially Thai & Viet), it's EASY..
they jump at every opportunity to have their photo taken.
i guess they are less embarrassed of their profession..
and while they are at it, they want full exposure to reap in as much $$$ as possible.
like what Gary has mentioned, cheek-to-cheek posing will almost guarantee a photo.
most of them don't know photo-editing could be done easily..