rule #1: you can't be too picky about stuff like people smiling or looking at the camera or keeping their tongues inside their mouths.
rule #2: there is no other rule.
so once a year, we move the furniture around, set the camera timer, and take about 20 of these. inevitably, by the third or fourth photo, there are tears, and, without fail, the first photo turns out to be the best of the bunch anyway, but still we continue the exercise.
and then we eat more donuts.