At the Dry-cleaners:
Lady: Why you take picture?… How do I look? (leans in to view the image on my phone)
Me: (shows her the image) Do you want me to delete it? I think you look beautiful.
Lady: (she apparently like her photo) How much did you pay for that smartphone?
(We then proceed to chat about smartphones.)
Bottom line: Do not be sneaky or play paparazzi. Respect the person in front of the camera. They are not preys.