Daddy gets the first appearance of ears on the side of the head. (It took 2 drawings for him to figure that out.) Daddy has a coat and a hat and a balloon.
Sean's giant smile looks just like him. Sean gets hands, feet and a "bus" to play with.
The second portrait he drew, and the ears are next to the eyes, like Mommy's. Luke's hair goes all the way around his head, because he totally needs a haircut. "Daddy? Hello?"
I don't know what to say, Clint. You get a hat, hair, nostrils, and fingers that start on the right hand and just keep going, which is Luke's signature move. Still, I get the feeling he knows something the rest of us only suspect...