Write your prompt like a creative brief. Include the billboard type, environment, subject, camera perspective, lighting, color palette, advertising style, and intended mood. For example: “large digital billboard in Times Square at night, premium sneaker campaign, dramatic blue lighting, cinematic street photography, wide-angle view.” AI image models can struggle with exact small text, so for precise slogans, prices, logos, or legal copy, generate the visual composition first and add the final text afterward.