So… children’s lips are very difficult. Their heads are somewhat shaped differently than adults. There’s more fat in their faces so it looks like their mouths protrude out more. It’s difficult to draw dimples and not make them look like wrinkles. The key thing here I think is the eyes. These don’t really look like children’s lips, but I have a feeling they would if their eyes were there. That seems to be a common theme. Most expression is in the eyes, so I’ve been finding there’s a lot of information missing without them.