Bek, have you seen the work of Phillip Lorca Di Corcia? He photographed people eithout their knowledge with a 500mm lens. He would pick out a specific spot to aim his camera and then wait for people to walk by. His use of light to separate his subjects from the environment was of utmost importance. I think your images are on the right track and an improvement from the previous work. It still seems to me though, that you need some kind of coherent and consistent methodology to approach the project with.