So this is one of my experiments. I setup and did some long exposure shots from the International Market Place. After reviewing the photos I saw this one girl who appeared to all three frames. I tried some Photoshop work to isolate her. Unfortunately, since these were long exposures, she had some motion as well so she's not a sharp/clean as I hoped. I processed the 3 frames in HDR Efex Pro using the Bleach Pass Filter preset, then took it into Photoshop to single out the girl.