Just to add, I think my favorite lines are on the very right (viewer's) edge of Rena going down her abdomen and her hip jutting out, and the very left edge of Aisii's hips where there's just that subtle curve into her rear. And, lastly, the space between Aisii's knees to ankles, and Mara's knee to her extended foot and bent toes. Something very organic about those two little spots of background peeking through that is very nice to see.
Some 18 year olds can look younger than their physical age says they are. Just like some can look older than they really are. Her face may say 14, but her body says 18, and they'd have to be 18 to be allowed to be photographed, by law.