画像のプロンプト
Vertical full-bleed image, native source proportions 673:1200. An ivory-white horse rears in side three-quarter view facing right, body diagonal from cropped lower left to head at x58%,y25%. Two bent front legs kick toward right, hooves around y63%, long flowing mane blows toward upper left. Several small vermilion red painted cross marks appear along side of neck and shoulder, strongest near x44%,y39%. Background deep navy sky, a few cream clouds at lower and left edges, tiny amber star near x36%,y11%. Hard upper-left sunlight lights mane and face, large blue-gray shadow across lower chest. No rider, wings, black coat, giant cross backdrop or blood.
Rendering: vintage mythological fantasy print, ivory gouache-like highlights, dusty cobalt sky, fine warm paper grain and sculptural hard-shadow anatomy. Preserve observed object count, relative positions and negative space. No stylistic fusion, decorative border, platform UI, invented watermark or signature. Do not add unrelated props or colors.