I'll provide my thoughts on these three shots of yours.
.
There is something here but there are too many distractions. I really wish this shot was just the man sitting with the girl looking over his shoulder. The problem is there are other people in the art work and they are now headless or missing half of their face which makes it visually distracting. Other distractions are the grocery bags, the bright area to the bottom left of the table, and due to the table and cut in the concrete the image appears to be tilted to the right. While the only thing you could control was the crop and framing of the image you must be aware of all the other pieces of the image. This is why street photography is one of the toughest to get right.
.
I like architecture, simplicity, shapes, and textures so I see some potential in this image. My suggestion is to do a high contrast black and white conversion to give it a bit more drama and abstract feel.
This is a great example of leading lines with the tracks leading to the back of the image. Two things working against you here is that the left and right side are unbalanced with the right side overpowering the left and the lighting is pretty bland. If you could retake this at sunset or sunrise when there is some nice golden light reflecting in those windows it would give this image a much more dynamic feel.
All have potential. Nice work.