Hmmm ... not to be overly critical, but Ai looks more like she got smacked in the mouth than having smeared lipstick. Of course, that belies her smile, but it just makes the image seem bizarre. Maybe it's just me.
I too could not think of a possible reason why people "misuse" a tag with a fairly well established connotation when this place added arbitrary criteria that differ from 99.9% of all common uses.