Well, funny concept, but I wonder who this unsuspecting passer-by was and how you came about the photo. The mouth indicates no little surprise! Did you shoot from the hip? Did you crop off her head to keep her privacy in the end? Is she a complete stranger to you?
How did she feel about you taking a picture of the more attractive areas of her body? lol... I barely had the guts to ask some guitarist on the street if I could photograph him, I could never do it to a girl and her mid-section!