I don't know about rules but Donald and many of the other B&W specialists here swear by this book. I plan to get it as soon as I can. I have other books by Michael Freeman and they are quite good. I have trouble seeing in B&W also and this has been highly recommended as the book to help in that area.
http://www.amazon.com/Complete-Guide...9262427&sr=8-7
This location looks like a really good spot. I notice you have a colour version in one of the other comps that I really like too. If it was close to me, I'd be going back many time. I do love the dramatic sky in both of the shots you have entered, but I know from experience how hard it can be to keep from crossing the line.
Actually the shot entered here, looks fine to me, I liked it right from the start, but when it did not get the votes, I started analyzing to see why, and the only thing I could come up with was the technical issue of blown highlights. On my screen it does not look bad at all.
Wendy