The first one is fantastic Randy. Very interesting geometry and textures. The combination of colors works very well.
Here are some thoughts:
- the intense highlights are a problem to my eye. Have you tried to deal with it in PP? I think you loose some of the rusty texture details.
- I would prefer a symmetry to the composition. We don't see the edge of the left "pipe".3
- A focus stack could improve the DoF although I like the lens blur on the top.
I also like #2, #3 & #4 are not that interesting for me.
Keep observing the world around you.
And alway carry a macro lens with you...
The full shot really wasn't that appealing