Weeeell I'm 100% self-taught. I've never looked up tutorials or anything either, I learnt anatomy through reproducing random poses and doing it over and over again till I had results. Then someday I started copying anime traits, and it became a very simple style half-anime half-random.
Then I decided, like, three months ago or something, to start all over again, create my own proportions, facial traits, features and all. My coloring technique is something you won't find anywhere else, too. Because it's heavily reliant on a feature of Photofiltre 7 that nobody uses. It became the style I have now, and voilà !
(That's probably because I have never even tried to look up tutorials or anything that my art looks so bad though ._.)