The first time a fellow bonsai person sees the bonsai you created that "moves you" they will slap a label on it. Not because you followed all the "rules" of that particular style, it is because it gives them a reference point. I am not a huge rule follower, however, I do think it is important to know the history of the different styles of bonsai and one thing that helps me understand them is the "rules" of that particular style. I am almost sure when you are creating your bonsai you have some formal and informal personal "rules" that you follow, don't you?Worry less about "style" and more about emotion. I kid you not, after doing this for 30 years, I find myself drifting away from the rules, and asking myself the question "does it 'move' me?"
Of course that is MY definition of bonsai - Mother Nature in a small form. Can I look at a bonsai (as an art form) and does it speak to me? It can satisfy all the rules of bonsai, in the way that the LA River can satisfy the rules of being a river... but is it Mother Nature? The best bonsai are those that are developed by man (and woman) kind... without leaving a trace. I have seen a handful of bonsai in my life that mystify me. And none of them are mine.