Turn one product photo into a studio ad poster with ChatGPT

Turn the product in my uploaded photo into ONE finished advertising poster. Portrait 4:5 (1080 × 1350). Generate the image itself, not a description.

LOOK
A bold studio campaign poster: one strong colour taken from the packaging, a giant headline word BEHIND the product, the product big in front, and a real surface with props at the bottom. Not a plain product photo with a title above it.

LAYOUT
- Background: fill the whole canvas with the product's main colour, with darker shadows and a few lighter highlights. If the product is white or plain, use its accent colour or a strong contrasting backdrop. No beige walls, plant shadows or outdoor scenes.
- Headline: 1 to 3 words, written by you for this product, huge, almost full width, across the top 35–45%. The product must cover part of the letters, but the word should still be readable.
- Product: the hero, about 55–70% of the poster height, middle to bottom. Don't stretch it. Keep the logo and label easy to read.
- Ground: stand the product on a textured platform or studio surface with a real contact shadow. Build depth with a foreground, the product and the background.
- Props: a few items that fit the category, near the base and lower corners. Food: real ingredients or crumbs. Drinks: ice or condensation. Shoes or tech: materials and surfaces, no food. Never cover the main label.
- Small text: one short, widely spaced line near the top. Optional: up to three short side notes, and a thin see-through strip at the bottom with three simple line icons and one-word labels.

TYPE
Big, heavy display lettering chosen for the product: condensed sans, sporty block letters, rounded playful letters or an elegant serif. Make the headline a shade of the background colour so it supports the product instead of fighting it. No swooshes, no script fonts.

KEEP THE PRODUCT REAL
Do not change the logo, label, colours, shape, cap or materials. Don't invent a side of the pack you can't see. Only use claims printed on the pack or that I give you. No made-up percentages, ingredients, certificates, health claims, offers or "buy now" text.

FINISH
Clean commercial studio lighting, real textures and believable shadows and reflections. No heavy glow, no plastic-looking surfaces, no random flying objects or big splashes.

BEFORE YOU ANSWER
Check: the headline is behind the product, the colours come from this product, the scene has depth, and the product and text are accurate. If it looks like "title on top + normal photo below", redo it.

Return only the poster, edge to edge: no border, mockup, watermark or extra text.

Make the headline bigger and put more of it behind the product. Keep the product label fully visible and change nothing else.