復古黃石公園海報，描繪間歇泉與野牛，中世紀風格，色彩柔和，紙張泛黃

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Create a vintage hand-illustrated poster featuring [SUBJECT / SCENE]. Use detailed black ink linework, simplified graphic shapes, subtle crosshatching, muted earthy colors, and a soft aged-paper background. Give it an authentic mid-century travel-poster / screen-print aesthetic, with slightly imperfect ink texture, gentle grain, faded colors, and a handmade printed feel. Keep the composition clean and elegant with the main subject prominently centered, balanced negative space, small atmospheric details, and minimal decorative elements. Add simple vintage typography reading “[TITLE]” at the top. Nostalgic, artistic, timeless, editorial, sophisticated, visually striking, vertical 9:16 poster composition.