Prompt for hierarchy, not just imagery
Great posters have one dominant element. Say which: 'bold typography as the hero, small supporting illustration' produces a type-led design; 'full-bleed illustration with title space in the top third' produces an image-led one. If you don't allocate space in the prompt, the model fills every centimeter and your text has nowhere to live.
Genre vocabulary is a cheat code: 'Swiss international style' gets you grids and sans-serifs, 'retro print texture, risograph grain' gets indie-gig energy, 'art deco frame, gold on black' gets gala elegance.
Sizing and print practicalities
Compose in 2:3 or 3:4 portrait for standard poster frames, and keep critical text away from the outer 5% of the frame (printers trim edges). For large-format printing, run the final through Nidhogg's Upscale tool — a 2x or 4x pass gives you the pixel density for A2 and beyond without visible softening.
Event flyers, movie one-sheets, wall art
Bands and venues turn out gig posters per show date; film students mock up one-sheets for festival submissions; marketers produce seasonal promo posters without waiting on a design queue; and plenty of users simply generate art-print posters for their own walls. Same tool, different prompt templates.