T-Rex: You know what we do in photos? SMILE.

T-Rex: You know what everyone knows we're doing just because it's a photo? SMILING.

T-Rex: So maybe it's time we drop the act, huh? When someone whips out a camera, instead of smiling, give it that "oh wow you just whipped out a camera" look.
Dromiceiomimus: The thousand-yard dead-eye stare?
T-Rex: PRECISELY.

Utahraptor: But we're the few children of history who GET to smile in our visual records!
T-Rex: Huh?

Utahraptor: Early photography took SO LONG that everyone's dour resting face was the norm! And painting's even longer. Past generations WANTED to look cool and good but had to settle for an eternity of "wow what's THEIR problem??". So we should smile, not just for US, but for all who came before us and couldn't!!

Narrator: LATER:
Off panel: Say "cheese"!
T-Rex: I'm smiling not NECESSARILY because I'm happy but because I've been convinced my ancestors would want me to!!
Off panel: Whoah
Off panel: That's the worst failure at saying the word "cheese" that I've ever personally witnessed