I find that having Mona Lisa obscured with her mouth showing, doesn't change a thing. It's that smile, isn't it? You just recognize it right off! I read a book once about the "making of Mona Lisa" about how she became so well known. It was a bit academic and I can't remember much about what I read.
Has anyone read anything like that? I'm still curious about it. How DID she become so well know?