OP's second and fourth photo are nice, despite me not enjoying the ideas behind the photos.
But I tend to take issue with homeless photosets. Not only is it cliched (I can't tell you how many black and white photosets of the homeless I've seen), I also find it exploitative. Now, that's not always the case, and if your photoset is driving at something more than "look at how happy or dignifed homeless people can be despite their circumstances" or "look at how bleak life can be", it can work. If it's a part of a larger effort to help the homeless, well that's fine. But if it's just for your "art"...well, gag me with a spoon.
These poor people are sitting on the street because they have nowhere to go, not because they are inviting you to photograph them in what can be a lowly state. Mental illness and drug addiction are not uncommon afflictions amongst these folk (as it is often the reason why they are homeless in the first place). If the state can't find the resources to take better care, at least we citizens can practice some empathy and allow them a reprieve from the paparazzi.