Dear Paulo, I found your image in a random online search for soccer images while I was working on a book cover design. Cropped, and with the sky extended upwards fading to solid blue---it conveys the message we want, and fits our purpose.
Sorry to say there's no money down to be made down this path, it's not for a major publisher...just an independent author who's going to make and peddle the book himself. His first and only novel.
May we have permission to use your artwork for this purpose? And if so, we can put a credit on the back cover of the book. I would imagine it would say something like: "Cover image based on the artwork of Paulo XXXX."