fairytales in pan's labyrinth

I enjoyed JS and Mr.N, but enough to write a paper on it. Pan's Labyrinth, on the other hand, was phenomenal. I laughed and cried with the little girl, and even though her rebellious nature often led her to chaos, I often wished I could have accompanied her on her adventures. I think that's what I want to write on: the fairytale part of the movie. I want to compare common fairytales and rules to the structure of her mystical adventures. For example, hansel and gretel's destitute background with Ofelia's surroundings, the rules of not eating or drinking when she's performing her duties, etc. What do you guys think? I haven't heard anybody else talking about this, but in case I missed it, let me know!! and I'll change topics.