The useful-page standard
Search-friendly visual posts should answer a real need: where the image works, what crop to choose, what license applies, and how the reader can adapt the idea. A page with only a generated image and a keyword title is too thin.
Alt text and filenames
Use descriptive filenames before upload and write alt text for the final visible image. Alt text should describe the scene, not repeat the title or promise a download that is not present.
Pinterest reuse
Pinterest metadata should be unique to the pin concept. Treat it as a distribution summary, not a duplicate of the SEO title.