What is really Mona Lisa smile?

Honestly in my opinion the movie Mona Lisa Smile was different from what I wrote before watching the movie. In this movie I would have to say my favorite part was the ending with Betty riding her bike beside the taxi and trying to touch her professor for the last time before she left for good. This movie taught much about friendship and true colors behind people. It showed me upon how a professor can change the littlest things and make them truly changeable into a beautiful "Mona Lisa". The theme of this movie makes me feel like without their professor I am sure that betty and her friends would have been lost and Wesley college of history of art and the girls in that class would have thought completely about themselves and their marriages. Not about the true future of themselves and friends yet, their professor used images to create a relate able story plot off of their own issues that the girls had.