Create high-CTR YouTube video thumbnails (1280×720, 16:9) — creator reaction faces, object heroes, before/after splits, bold-text hooks, tutorial UI shots — with duration-badge safe zone, 3-element rule, and mobile-size readability. Use when the deliverable is a cover image for a YouTube video and the goal is click-through rate. Do not use for paid ad creatives or non-YouTube platform covers. Do not use for artistic posters, movie/book/album covers.
