GPT Image 2: Flat Illustrations (Consistent Series for Slide Decks)

【用途】簡報／提案投影片插圖，這張代表的概念＝[概念]。
【視覺風格】扁平向量插畫（flat vector illustration）：純色色塊、無漸層或極淡漸層、無外框陰影、圓角幾何造型，現代乾淨。主色 [主色]＋輔色 [輔色]＋一個中性灰，全系列共用同一組色盤……

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The real challenge with slide illustrations isn't making one look good — it's making ten of them look like they belong to the same set. The technique: treat this prompt as a template, only swap out the [concept] field, and keep everything else (color palette, style, composition, no facial features) word-for-word identical across every generation — the style stays consistent as a result. GPT Image 2 follows constraints like 'fixed three-color palette, no extra colors' and 'consistent line weight' far better than older models, which is exactly what flat-style illustration depends on — add one more color and the whole look falls apart. Telling it to keep facial features minimal or omitted avoids the uncanny look AI often gives faces, and also makes the image more neutral and reusable. Requiring a solid-color or transparent background means you can cut it out and drop it onto a slide of any background color without it looking out of place. Beginner-friendly — barely needs any tweaking.