What's the different on the little girl face-teenager face- and an adult woman face? It's a really hard question, but here some hint, that how you can show on your picture, how old are your character. So, the size of the eyes's form is always same, it isn't changing, when a girl grown up. But a little girl's face is rounded, and when she grown up, her face shape is (generally) changing to an oval form. A child's nose is snub, and her mouth is more smaller. When a teenager grown up, the size of their face parts doesn't changing, but she has a more characteristic face (and of course, more furrow too).