일본어 온라인 강의 썸네일 배너

Clean promotional banner and video thumbnail in a 16:9 horizontal layout. Split composition: on the left (40% width), a realistic waist-up portrait of [a smiling Japanese woman in her late 20s with shoulder-length layered black hair, wearing a peach sheer button-up shirt over a white ribbed camisole and a delicate gold necklace], posed against a bright, soft-focus daylight background. On the right (60% width), a large rounded white organic panel over a pale powder blue background with decorative dotted grid accents in corners and light diagonal hatching near the edge. Crisp Japanese typography containing exactly four text elements: 1) a top dark navy rounded pill badge reading "[GPT Image 2 実践編 ③]"; 2) a prominent navy Mincho serif headline reading "[基準画像を\n作った、その次は？]" with a coral underline under the second line; 3) a framed subtitle reading "[人物固定の具体的な使い方]" with "[具体的な]" highlighted in coral; 4) a bottom checklist row featuring a pale blue circular checkmark icon followed by "[毎回どの基準画像を使う？]". Polished educational course aesthetic, airy spacing, no harsh shadows.