This is such a great capture, there's nothing like standing out from the crowd! I love how the young woman appears to be walking through the crowd with a purpose, yet no one seems to react to her presence. However, she has noticed Mr Lincoln, the photographer, and he has capture that split second where the woman has made eye contact and is wondering whether he is taking a photo of her or not. Great timing and great composition. I would have liked to have seen a shot taken a few seconds later as she walked past the elderly gentleman on the left, if only to see his reaction.
Mr Lincoln is a street / candid portrait photographer who has taken some truly expressive photographs. I strongly recommend that you use the link above to see the image on Flickr and take your time to browse through the rest of his work, you won't regret it.