Multi-Step Prompt Generation Workflow for Product Posters

Input this instruction, allowing the AI to complete the entire process step-by-step: extracting selling points, determining style, determining layout, and finally generating a complete, system-wide prompt. Finally, give the AI-generated prompt to the Nano Banana Pro model (it must be Pro). You can first provide some overall style prompts separately as general constraints. Then, whether generating images individually or in batches using third-party tools, it is possible.