At the heart of the Too Perfect theory is the insight that magic works best when the illusions it creates are open-ended enough to invite the viewer into a credibly imperfect world. In every art, the Too Perfect theory helps explain why people are more convinced by an imperfect, “distressed” illusion than by a perfectly realized one.
When special-effects people talk about “selling the shot” in a movie they're making sure it doesn’t look too neatly and cosmetically packaged––that it is not lingered on long enough to be really 'seen.' (All special effects appear handmade when studied closely.)
Perhaps it's why we more readily connect with the more human, more attainable, un-airbrushed Marilyn, beauty spot and all.