In the first, the image isn't compelling enough for the selective desat. you've done here. The sky looks rather flat. The lines and patterns are well composed if you are trying to show the fenced-in and protected nature of the location -complete with lifesaving equipment. If you want to draw attention to the life-saving equipment, you might do well to show more of why it's needed (the beach/water).
I like the lines and repeating patterns in the second image. This is my favorite of this set.
You choice of focus is interesting in the third. Trying to send a message are we? 