Here's a tutorial on how to do double exposure on Photoshop. Inspire your creativity with our unlimited downloads of high-quality, royalty-free photos, vectors, illustrations & other design elements from GraphicStock.
Could be an inspired waatercolor. "En las nubes" by Antonio Mora.
This might a little too 'far-out' for you but we could use a 'double-exposure' photo effect to achieve a great montage for the cover. It could be a combination of a kayak or a kayak paddle, a person, a splash and the carvings... it would certainly stand out!