I agree, #1 is good and the vignette you added works well with the natural framing the brick wall provides. Your fill flash is a nice ratio to the ambient. I'd weaken the vignette on the bottom of the frame because it works against the stair frame imo.
#2, in addition to the aforementioned broken hand and strange pose, the vignette doesn't work for me here (as is usually the case). Also, there's a strange artifiact adjacent to her left wrist... it almost looks like a shadow from the flash against the ground, but not quite... maybe a problem caused by your processing? She appears to be a bit underexposed while the background is correctly exposed, whereas the opposite would be better.
#3 I like the color pallette you chose, but the vignette is very distracting for me.
#4 Probably the worse case of vignetting. I recommend you cease from using vignette. It is not a magical setting that makes photos look better. It's very easy to overdo, and makes them look bad. Also, you have a white balance issue, she looks orange. Easy to fix in RAW. What can't be fixed is the light direction giving her racoon eyes.
Your composition gives equal weight to her, the sign, and the telephone pole. The telephone pole isn't involved in the 'story' so it needs to be gone. You could fix in post, but by far the ideal solution is to avoid background clutter before you open the shutter. Finally, I feel like the shot composition is boring. The location has potential, but I'd like to see a more interesting angle... perhaps get up close to the sign and shoot up at her, maybe having the sign in the foreground, or not including it at all. Including it definitely tells a different story, so it depends on what you're going for. Best solution, do several with and without so you can decide at home (perhaps you did this).
#5 Looks out of focus, and I agree with above. The "ADH" has as much weight as she does. Are those her initials? If so, I'd not include the rest of the graffiti as it confuses the message. If it has nothing to do with her, it also confuses the message because it's red and right next to her, fighting for attention. Also, the light appears to be only on-camera flash which isn't appealing.