Building a Watercolor Book cover workflow
The watercolor direction works best for a book cover when the prompt describes composition, lens or viewpoint, material behavior, lighting, and the intended emotional response instead of relying on the style label alone.
How to evaluate Watercolor Book cover results
Keep the subject and hierarchy specific to the book cover. Generate controlled variations, compare edge detail and visual consistency, then refine the strongest watercolor result rather than changing every prompt variable at once.