That is a lot of pictures to critique so I will try to generalize to get as much in as I can.
I. Get a tripod, a few of those shots look a little roughened up.
II. 6. Hope that's not a POE
III. 4,9,10,11. Those seemed to lacks clear focus on the subject (Only opinion) compared to some of your others such as 1,2,3, or 8. The coke can is a weird one as you had a very clear subject but I feel that the clutter on the ground took away from the simple combination of wood and machine, maybe a angle pointing upward showing the machine in a more open area?
IV. All of your photos are pretty bright, this is less of a critique and more of an excuse for me to say try some of your camera settings out and see what looks nice in different areas. I think if you took decrease your aperture size a little it could look cool in this location.