Thes represent the book well. I like how the main ideas of the books were used as the main images. Risa Rodil is another artist that has designed book covers for Harry Potter. Again using the main part of each story to create an image for the front cover.
Artamanen: untitled by Robin Macmillan Another Voice, when I am sleeping, cries 'The Flower should open with the Morning skies.' And a retreating Whisper, as I wake - 'The Flower that once has blown for ever dies.