Although this image is subject to copyright, it is covered by US fair use laws because:

1. The image is only being used in the article about the Lionboy series for informational and educational purposes.
2. Use of the book cover visually identifies the book and its author in a manner that mere prose cannot, and meets all criteria in WP:NFCC.
3. This image enhances the article in which it's displayed, as it provides an immediate relevance to the reader more capably than the textual description alone.
4. The image is not replaceable with an uncopyrighted or freely copyrighted image of comparable educational value.
5. The image is the primary means of visual identification of one of the three books in the series.
6. The image is a low resolution image of the book cover, in an inferior graphics format (JPEG).
7. The image is only a small portion of the commercial product.
8. The use of this image will not affect the value of the original work.
9. The use of this image will not limit the copyright holder's rights or ability to distribute or make a profit from the original. In particular, copies could not be used to make illegal copies of the book.