Nah don't think there should be any rules on what makes a good picture, at least, even if have, they can change over time
not sure about rules, but guidelines?
i have learnt that, when you are a nobody who just started photoghraphy,
there some sort of guidelines how to capture and compose pictures.. and ppl will judge you
on how you should have follow "those" guidelines.
when you are somebody established, heck the rules and guidelines! everything you do, sure have someone to fav it! ah ha!
the golden rule is not a rule:
Yes there is.... "Rule of thirds" @ http://en.wikipedia.org/wiki/Rule_of_thirds
"There are no mistakes, only lessons. Growth is a process of trials and errors."