Most of these seem to be pretty much the same photograph. Only in a few cases am I getting any sense of "portrait" here, mostly I am getting "oh look, another lazy headshot of a poor person". Several of them are just full-on exploitation with no particular redeeming value that I can see.
The very second photo on in the thread, the old lady where it looks like you tilted the front standard, was a very very bad idea. I see what you were trying to do, but the look is far too distracting and weird looking to succeed.
You do quite well with the environmental portraits, they are, uniformly, head-and-shoulders about the headshots. You do best when you are engaged with the subject, and when the camera is pulled back a bit.
ETA: This is a very very common theme, and it's problematic for the following reason: you are relying almost entirely on an interesting subject to carry your photograph, and with all due respect, poor/homeless people have enough to do without carrying all these damned photographs for all these damned photographers.