How to Generate Consistent AI Images — Prompt & Style Guide

Quick Takeaways

Avoid stacking contradictory style terms like "photorealistic 3D isometric flat vector watercolor." Pick one clear medium.
Test how your image looks at both 1200px wide and 320px card thumbnail size before publishing.
Always convert large PNG exports to WebP or AVIF so hero images do not hurt Largest Contentful Paint (LCP).

Task Objective & Prerequisites

To generate consistent AI images: (1) choose a tool suited to your style (Midjourney for editorial aesthetics or ChatGPT for diagram/conversational edits), (2) open the generation workspace, (3) write a 4-part prompt covering Subject, Composition, Medium/Style, and Color Palette, (4) lock your aspect ratio (such as 16:9), (5) generate an initial grid, (6) refine details with region repaint or variations, and (7) upscale and compress to WebP.

What You Need Before Starting

•Access to an AI image generator such as Midjourney or ChatGPT.
•A defined hex color palette or 1–2 reference images for visual consistency.
•Target dimensions for your placement (for example, 16:9 for article covers or 1:1 for icons).

Recommended Tools for This Guide

Midjourney

Dedicated image generator with style references and web repainting.

ChatGPT

Conversational image generation and prompt refinement.

Runway

Animates still AI images into short motion video clips.

Step-by-Step Implementation Guide

Choose the Right Image Generation Tool

Select Midjourney when you need cohesive editorial illustrations, textured lighting, and style reference (--sref) locking. Select ChatGPT when you need conversational revisions or simple conceptual diagrams.

Copyable Prompt / Template:

Decision rule: Multi-article editorial series -> Midjourney with --sref; single quick blog graphic -> ChatGPT image tool.

Expected Output: You match the tool to your workflow before spending compute credits.

Enter the Creation Interface and Set Defaults

Open the Midjourney web creation bar (or ChatGPT composer). Before typing your scene, note your required aspect ratio and whether you need a light or dark background to match your page layout.

Copyable Prompt / Template:

Workspace preset: Aspect Ratio 16:9 landscape, Stylize Medium, Raw/Clean mode.

Expected Output: Your workspace is configured to output widescreen frames that fit article headers without awkward cropping.

Write a Structured 4-Part Visual Prompt

Order your prompt from most important to least important: (1) Main Subject & Action, (2) Framing & Composition, (3) Artistic Medium, and (4) Color Palette & Exclusions.

Copyable Prompt / Template:

Flat editorial vector illustration, 16:9 landscape. A clean workspace desk with a laptop showing an abstract node workflow and a magnifying glass. Soft light background #F8FAFC, brand blue #4F6EF7 and purple #8068F5 accents, minimal geometric shapes, no text, no letters, no watermarks.

Expected Output: The model receives unambiguous instructions on subject, style, and color harmony.

Adjust Aspect Ratio and Style Reference Parameters

Append explicit parameters (such as `--ar 16:9` and `--no text letters watermark` in Midjourney) or attach a previously approved illustration as a style reference so new images share the same visual language.

Copyable Prompt / Template:

... --ar 16:9 --sref https://example.com/approved-style.webp --no text letters logo

Expected Output: Generated candidates adhere to the exact frame dimensions and brand color palette.

Generate the Initial Grid and Evaluate Composition

Run the prompt and inspect the generated options at thumbnail size first (to check overall contrast and focal point) and then at full size (to check for distorted geometry or cluttered corners).

Copyable Prompt / Template:

Checklist: Is the focal point clear at 320px width? Does the background clash with page borders?

Expected Output: You identify the strongest composition before spending credits on upscaling.

Refine Imperfections with Region Repaint or Variations

If a frame is 90% right but has a cluttered corner or unwanted artifact, use Vary Region (inpainting) to select only that area and regenerate it cleanly.

Copyable Prompt / Template:

Inpaint selection: Replace the cluttered top-right corner with clean soft #F8FAFC negative space.

Expected Output: A clean, balanced illustration without re-rolling the entire composition.

Download, Convert to WebP, and Add Descriptive Alt Text

Download the upscaled PNG, convert it to WebP (targeting under 80–120 KB for fast LCP), and set explicit `width`, `height`, and descriptive `alt` attributes in your HTML.

Copyable Prompt / Template:

cwebp -q 84 cover-illustration.png -o cover-illustration.webp

Expected Output: A fast-loading, responsive raster image ready for production SEO.

Common Mistakes & How to Fix Them

Mistake: Garbled pseudo-text or random letters appearing on screens and signs

Fix: Explicitly include "no text, no letters, no numbers, abstract UI bars only" in your prompt and repaint any accidental text regions.

Mistake: Overly busy compositions that distract from article headlines

Fix: Specify "minimalist composition, generous negative space, single central subject, flat vector style" instead of cinematic hyper-detail.

Mistake: Inconsistent colors across different articles

Fix: Keep a saved prompt template containing your exact hex codes (#F8FAFC, #4F6EF7, #8068F5, #111827) and reuse a consistent reference image.

Frequently Asked Questions

Why should I avoid putting text inside AI-generated images?

Diffusion models frequently misspell words or render uneven kerning, and text baked into an image cannot be translated, indexed by search engines, or resized cleanly on mobile screens.

What image format and size should I use for blog covers?

Use WebP at 1200x675 pixels (16:9 aspect ratio) with explicit width and height attributes to prevent Cumulative Layout Shift (CLS).

Can I use Midjourney images as starting frames for AI video?

Yes. Exporting a 16:9 still frame from Midjourney and uploading it to Runway’s Image-to-Video tool is one of the most reliable ways to control video style.