C&C per req:
1. Too much empty space; most of the black area could be cropped off.
2. I don't get much from this; the graffitti might be interesting, but I don't think you've captured that. Consider a different time of day with more dramatic lighting (sunrise/set), and perhaps a tighter crop on one area.
3. Looks to me like a little too much skin-smoothing. I'd suggest cropping the bottom just abover her left hand to eliminate the purse and 'phone and the disembodied finger.
4. Again, not getting a lot from this image. No one is looking at/toward the camera, nor doing anything really of interest. The woman on her own might make a good street photo, but as-is, just a little too much of nothing IMO.
Just my $00.02 worth - your mileage may vary.
~John