How to Keep the Same AI Model Across Every Image: The 2026 Character Consistency Guide

Short answer: To keep the same AI model across a campaign, create one strong reference image, build a reference sheet (front, three quarter, profile, full body), and feed it into every generation using your tool's character or image reference feature. For larger projects, train a small custom model (a LoRA) on 15 to 30 approved images. Seeds alone are not enough; they only help when the prompt barely changes.

Why consistency is the hardest problem

Every AI image is generated fresh. Without guidance, the model changes face shape, age, skin tone and body between images. For a brand, an inconsistent face looks like a different person in every post, and an inconsistent product is simply wrong.

Method 1: Reference sheet (start here)

1. Generate or choose one image of your model you love.
2. From it, create a sheet: front face, three quarter, profile, full body, neutral light.
3. Save the sheet and use it as the reference for every future image.

This works in most current tools and costs nothing extra.

Method 2: Character and style references

Most leading image tools now accept a character reference image alongside the prompt. Upload your sheet, then change only the outfit, pose and setting in the prompt. Keep the description of the person identical every time.

Method 3: Seeds

A seed fixes the random starting point. Reusing it helps when you make small changes (lighting, colour) but breaks when you change pose or setting. Treat seeds as a fine tuning tool, not a consistency system.

Method 4: Train a custom model

For brands producing hundreds of images, training a LoRA on your model or product gives the most reliable results. You need 15 to 30 consistent, high quality images with varied angles and light, and the rights to every image used.

Which method for which job

Job	Best method
A few social posts	Reference sheet + character reference
A full lookbook	Reference sheet + strict prompt template
Ongoing brand model	Trained custom model
Product consistency	Clean product photo as image reference in every generation

Prompt template that keeps faces stable

[Name], the same woman from the reference: [fixed description: age, face, hair, skin]. Wearing [outfit]. [Pose]. [Setting]. [Light]. Keep facial features identical to the reference.

Change only the parts in brackets that need to change.

Go further

Read our quick resource on AI character consistency, then explore ready prompts in the Prompt Library. The AI Consistency workshop shows the whole system for models and products, live.