What makes a girl look innocent?

Describe this in details please, like hair, makeup, style, etc. People are always saying this about me. Is it because I have a roundish face and smile a lot? I'm around funny people so I'm always laughing or smiling at things that's happening. I'm not as innocent as some guys assume, I tend to attract guys who are like "you're so cute like a doll" I might look like a baby doll on the outside but I can turn Chucky in 3.5 seconds so it's not good to piss me off or try to play me. I'm usually nice though, but I wonder what people generally think about those who look "innocent" and what makes us look this way.
What makes a girl look innocent?
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