Research an interesting or obscure fairy tale (look outside your own culture). Choose a specific moment from the story to illustrate. Before you draw, write a description of the scene in your sketchbook - be specific.
The best clues are small and purposeful (don't beat your viewer of the head with it)
Color gives meaning
Think about location
Blur things or hide them on purpose
You can choose to update the fairy tale or keep it classic (how would Cinderella look today?)