This image is of a book cover, and the copyright for it is most likely owned either by the artist who drew the cover or the publisher of the book. It is believed that the use of low-resolution images of book covers

• to illustrate an article discussing the book in question
• for identification and critical commentary on the film and its contents
• on the Harry Potter wiki, hosted on servers in the United States by the non-profit Wikia,

qualifies as fair use under United States copyright law. Any other uses of this image, on Wikia or elsewhere, may be copyright infringement.