Facial expressions in photography change with the times, don't they? My stoic great great grandparents look like ghostly pod people (post-life force sucked out of them a la The Dark Crystal). Immovable as statues, their faces were drawn into fixed stares. Not a wandering eye or disobedient child in sight... just utter, eerie stillness.
Slowly during the twentieth century, the smile crept into photography, notably the ginormous toothy (top and bottom, baby) grin that so demarcates an American in any photo. Even models started smiling after a time (Christie and Cheryl, you were pillars of wholesome American beauty). Anyway, things seemed to be progressing (transgressing is more like it) in a certain manner over the last 15 or so years into the realm of the patently ridiculous. We now pose for pictures in a way that would have had Dali himself in peals of laughter.
We've taken the pout into the silly stratosphere, producing what can only be referred to as Duckface because the lips are pushed out in such an exaggerated manner as to mimic the beak of Daffy Duck himself. And daffy it is.