1. This is a very nice shot, but it needs to be straightened just a bit. It tilts to the right. The focus, composition and contrast are all good.
2. I like the colors in this and for some reason find the shot interesting. I'm not sure what it is I'm looking at though. Perhaps thats why I find it interesting. Is this part of a mural? Grafitti?
3. The sky is blown out & the top of the machine on the left is cut off. I don't find this shot to be very interesting.
4. Very busy and I'm not sure what the point of interest is supposed to be.