There are methods to make models comfortable. Some are already ready to act the part, while others need some handholding. In advance of the photo shoot, I provide models the story lines (or script) I want them to narrate. This is crucial, since with it in mind, they can act the role. The other method is to encourage them as they pose...not so much as how or where they are to stand, but reminding them of adopting certain poses following the script as in "show me how Meili wishes she had never met the gweilo"...or "show me how Hua is scared of seeing her aging lover...".
Some of these 'singalong' parlors still exist, faded and tired but otherwise unchanged, offering a taste of popular and cheap entertainment from a past era. How these survive in anyone's guess. The parlors usually have an organist (who can also play a guitar) and a handful of habitual customers who sing Cantonese songs...and occasionally Western oldies such as "Sealed With A Kiss" by the Canton Singing House organist.