Answer:

SMILE

Answer	Crossword Clue
SMILE	"I'll Never .. Again"
SMILE	Shutterbug's request
SMILE	"Cheese!" alternative

SMILE	It may be flashed
SMILE	:-)
SMILE	Put on a happy face
SMILE	Funt command
SMILE	Picture-posing requirement
SMILE	Say cheese
SMILE	Frown, flipped
SMILE	Flip a frown

SMILE	Say "cheese"
SMILE	Prepare to be shot?
SMILE	"Candid Camera" request
SMILE	"Say cheese!"
SMILE	Dimple creator
SMILE	Show one's pearly whites
SMILE	Part of a pose, maybe
SMILE	Request before a shot

SMILE	Pre-snap request
SMILE	Upturned mug?
SMILE	Beam
SMILE	Umbrella metaphor in an old song
SMILE	React to a camera
SMILE	Amused look
SMILE	Grin
SMILE	Upside-down frown

SMILE	Mug for the camera
SMILE	One may be radiant
SMILE	One may be sly
SMILE	One may be wry
SMILE	Prepare to be shot
SMILE	Sign of pleasure
SMILE	The parenthesis in :-)
SMILE	Look happy

SMILE	Photographer's request
SMILE	Request before a snap
SMILE	Command before a click
SMILE	Your umbrella, perhaps
SMILE	Dimple maker