this is by far one of my favorites of yours...we have several of these storage tanks around here but I can't seem to get the right angle (need to get beyond the fences) or lighting...but when ever I see one...this is the picture that comes to mind...
Would have been a fav in perspective, can't see how it fits thirds. The vertical on the tank ison the quarter line and so just a bit of the imapct is lost
This is fun to look at. Simple colors and subject. Composed well as an image. I'm not sure I get your take on the rule of thirds for this. The stairs lead me more to a sense of leading lines - there isn't a subject or focal point of interest that stops me in this photo. Don't get me wrong, I like the photo overall. Good luck in the challenge.