Usually when it's difficult to get the composition right, I usually can't go very wrong by using the rule of thirds as backup. As for exposure it's no rule....it's just a matter of intuition and a bit of experience. Difficult situations require me to bracket exposures and low light situations require the little exposure guide I mentioned in my little tutorial, as standard exposure....so I still need to bracket. Perhaps one little rule for myself is that I have to use my pola filter when shooting in forrests and things during a dull day or when shooting anything with running water. Oh, and for film I have the rule never to buy any film that's not Fuji, Kodak nor Ilford and never to buy any film that's 200. 200 film isn't as sharp or fast as 100 or faster film nor is 200 slow enough for other situation with less light.... Nothing else...that's it :P