上半保留真實，下半重新塗色

Turn each uploaded photo into its own high-end design poster, built on a [composition ratio: 3:4] vertical split where the top and bottom halves sit at a strict 1:1 — each claiming half the frame. Keep the top half as the original photo. For the bottom half, first identify the core theme most worth remembering from that photo, then rebuild it as a [illustration style: pastel hand-drawn graffiti material collage illustration with retro paper texture]. Pull [color count: 2–4 kinds] of the most vivid, friendly colors straight from the upper photo to re-tune the palette below.

把每張上傳的照片都做成一張獨立的高階設計海報，採用[composition ratio: 3:4]豎版分割，上下兩部分嚴格1:1對半分，各佔畫面一半。上半部分保留原圖。下半部分先提煉出原圖裡最值得記住的核心主題，再把它重建為一幅[illustration style: pastel hand-drawn graffiti material collage illustration with retro paper texture]。色彩上直接從上半原圖裡抽取[color count: 2–4 kinds]種最鮮活、最友好的顏色，重新調配到下方畫面裡。