How to Quickly Create Posters with Midjourney AI: A Step‑by‑Step Guide

AI technology is becoming a designer's inspiration library, analyzing massive design works and artistic styles to provide creative ideas and expand design thinking.

This article shows how to use Midjourney to quickly generate posters. By entering keywords and adjusting parameters, Midjourney automatically creates images that help designers complete poster tasks efficiently.

Using Midjourney, we produced autumn‑themed posters about "play". While the AI can generate multiple drafts in a day, the raw outputs often contain missing objects or artifacts, requiring post‑processing in Photoshop for repair, color correction, and layout refinement.

To create a specific poster (e.g., a camping scene in autumn), start by describing the desired image with keywords. Identify issues such as wrong size, small subjects, unsatisfactory style, or cluttered composition, then iteratively refine the prompt.

Key adjustments include:

Change aspect ratio using

--ar 9:16

.

Add terms like "close up" to increase subject prominence and reduce unnecessary details.

Specify style keywords: "illustration" for illustration style, "3D", "clay material" for 3D, or "Disney", "Pixar" for cute styles.

Select the model version (e.g., niji5, style expressive).

After each refinement, generate new images, compare details and composition, and if the color tone is still off, adjust with additional keywords such as "high saturation" or "bright colors".

Example keyword list used:

Autumn, in the forest, a cute girl and a handsome boy sit outside a tent and smile happily, next to a boy playing, landscape, clouds, mountains, streams, trees, maple leaves, cartoon style, Disney style, Pixar, natural light, 3D, C4D, NFT, front view, movie lens, close shot, soft color, soft light, high definition, detailed rendering, 8K --ar 9:16

After selecting the best‑looking image, perform Photoshop repairs on obvious defects, adjust brightness and saturation, and add textual layout to finalize the poster.

For more precise style matching, a reference image can be used by placing the image URL before the aspect‑ratio parameter in the prompt (e.g.,

<image_url> --ar 9:16

).

Separating main elements from the background during production helps avoid overlapping issues and simplifies post‑processing.

Overall, Midjourney offers designers a powerful way to generate diverse visual concepts, spark inspiration, and explore limitless creative possibilities, though human refinement remains essential for achieving polished results.