Create ONE finished vertical illustrated poster about 1920s Jazz Age culture, 4:5 portrait, full bleed. Create a playful, dense, symbolic character collage centered on one oversized friendly flapper woman. She has a short black bob, large expressive eyes, rosy cheeks, and a small smile. She wears a black sleeveless fringed dress, long pearl necklaces, black opera gloves, and a jeweled headband with a large golden feather. One gloved hand holds a long cigarette holder. The central character occupies roughly 55–70% of the poster height. Treat her dress and body as a container for the decade: embed miniature jazz musicians, dancers, nightclub scenes, stepped skyscrapers, and geometric Art Deco ornaments across the garment and around her silhouette. Build a dense vertical pyramid composition. Place a golden sun disc and an Art Deco skyscraper skyline behind her head. Add a vertical sign reading "JAZZ" at the upper left. Arrange a saxophonist, trumpet player, pianist, and dancing couples through the middle of the composition. Fill the lower section with a large black vintage automobile, a brass gramophone with a wooden cabinet, black records, cocktail glasses, and a suspension bridge. Give selected props, including the gramophone, one record, and two cocktail glasses, matching friendly eyes and tiny smiles. Do not anthropomorphize every object. Use overlapping scale changes and integrate the imagery into one continuous illustrated collage. Keep the heroine dominant, with small breathing spaces between clusters. Style: playful mid-century children's editorial illustration, contemporary paper-cut collage, retro educational poster, and bold souvenir graphics. Flat shapes, slightly imperfect handmade geometry, simplified rounded anatomy, crisp silhouettes, fine printed-paper grain, soft screenprint texture, and restrained shading. Palette: warm cream, golden ochre, near-black, muted jade, warm peach, and small ivory highlights. Suggest brass and gold with flat printed colors. At the bottom, set the exact title "1920s" in enormous golden-ochre condensed retro block lettering, with a thick black outline and a solid black offset shadow. The title occupies approximately 15–22% of the poster. Place a small black city skyline beneath it. Warm cream paper background with subtle fibers and speckling. One single poster. No grid, no separate panels, no photorealism, no 3D CGI, no glossy plastic, no complex gradients, no extra text beyond "1920s" and "JAZZ", no watermarks.