Naomi doesn't look extremely pleased with the fact that Marcail is taller than her. That's not what she's frowning about, though. You know what she's irritated about? Henry. He was trying to get into the photo and he had been told it was just for the girls this time. She's a feisty one, that Naomi!
Whatever the case, I think it's still a cute photo and captures the girl's personalities well.