Which guideline applies to configuring images and icons in interfaces?

The guideline that emphasizes using the "Avatar" style to display profile images of people is crucial for ensuring a user-friendly and contextually appropriate presentation of images in interfaces. Avatars are a way to personalize user interactions by providing a visual representation of individuals, which fosters a more engaging and relatable experience. This style is specifically designed for representing people, so it aligns with best practices by making profiles visually distinct and easily recognizable, thereby enhancing user experience and accessibility.

In the context of other guidelines, using file formats like PDF or TIFF is generally impractical for web interfaces, as these formats are often not optimized for quick loading and responsive display. Having a large selection of indicator icons, while it might seem engaging, can actually lead to confusion if not used judiciously or with consistent meaning. Finally, while providing a text alternative for icons is vital for accessibility, it is a separate guideline that complements the use of avatars rather than replacing the need for user-focused design principles that highlight individual representation.