What I think Sparky means is that there isn't really a subject here. You've got the scene, but nothing is happening. The graffiti isn't being emphasized as the subject. There are lines leading away from it, making it hard for the eyes to comfortably rest upon them. The compositions are a bit busy, if you get my point.
In #1 you've also got some weird thing sticking up from the street that's super annoying. In my humble opinion, #3 is sort of nice. The person makes ALL the difference. Now there's a story here, hidden. Now it's up to us to figure the image out. The person adds a dimension that the other ones lack. the birds in #1 doesn't do the same for me. I prefer street shots in black and white, but that's personal taste.