Expression Lab is a FACS prompt generator for directing facial expressions in AI images.

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Instead of prompting vague emotions such as "sad", "subtle smile" or "worried look", the tool lets you compose a face through FACS Action Units. Each control changes a wireframe face and generates a structured prompt that can be copied and adapted.

Expression Lab is a practical companion to the method described in CreativeAI's article: Directing emotion, expression and movement in AI images and films.

The idea is simple: don't describe an emotion, direct it. Define the facial action, tune the intensity, preserve identity, and give the model clearer instructions.

Use Expression Lab to:

• build more precise portrait prompts;

• test combinations of Action Units;

• compare subtle emotional variations;

• avoid exaggerated or incoherent faces;

• turn a creative intention into visible facial cues.

Expression Lab is a tool created designed for artists, creative directors, AI trainers and image makers who want more control over facial expression.