A recent scenario. Kid gets their face painted and it seemed to take longer and look better than the few in the line ahead of us. When finished the person running the operation pulled out a camera and asked to take a photo “For my Facebook feed”.
That's not an explanation, and that's clearly someone trying to show off their work that happens to be on your kid (aka use them as an ad), not a friend trying to post a picture of the two of you at a party.