Design a book cover

I require a cover for my book. The template provided by the publisher is included below. I am looking for an illustrated design. The image for the front cover should depict a battle scene between a man and a red dragon. The image I've had in my head has the man hiding behind a rock in the foreground while the dragon blasts fire from the background. The battle takes place in a canyon. Specifics about the man can be found in the attachment below. The title of the book: "The Ranger" must appear on both the cover and the spine. The Author must also appear on both cover and spine: E.A. Whitehead The text for the back of the book is attached below. If possible, I would like the image that is on the front to wrap to the back. Obviously the image on the front is the primary concern. I would be happy if it was simply a continuation of the background from the front. Please note, the image must extend to the outer edge of the red lines of the template, but no text or important parts of the image can touch the outer lines. As this is going to be part of an item I am selling, I obviously would require the intellectual property of the image. I would be happy to credit the artist on the copyright page.