No, there is many tutorial on the internet (Especially on DeviantArt). What I think is the best to do is to pick up some technics from the others in order to create your own. The hardest is to find the technics you prefer. First step is to improve the line drawing (Perspective, proportions, movements, expressions...), secondly invest in a good old Tablet (wacom's are good), lastly trying plenty of painting technics... The main rule is to hear the critics and allways find challenges !