If — and only if — you are Bob Saget, DO raise your arm.
DO adjust your arm so that your phone is more in front of your head.
DON'T make your nice-looking friend wait for you to get the lighting right.
DO try and get the perfect angle.
DON'T be a dummy — SMILE!
DO adjust one more time. This is your selfie. This is your life. You are Bob Saget, goddamnit.