Google Ads has introduced a new section in Performance Max campaigns allowing advertisers to provide visual guidelines for AI-generated images. This section facilitates advertisers in defining expected image styles, specifying content, and identifying elements to avoid.
Among the new features, users can upload up to three reference images to serve as a style guide for AI. Advertisers can also include content guidelines, such as showcasing people using a product, and instruct AI to omit distracting backgrounds.

Each guideline entry supports up to 300 characters. Additionally, advertisers can continually add more guidance using an available button.
This update was spotted by Marcin Wsół.