This document provides guidance on creating effective visual prototypes. It defines a prototype as a working model that communicates an idea interactively by showing rather than telling. Prototypes should address critical questions and problems. To be effective, a prototype must be convincing by knowing its audience, being relevant and timely, and standing out. Visualizations like user journeys, workflows and scenarios can help sell big ideas by finding shared insights. Tips include evolving the prototype over stages, adding real photos instead of placeholders, and starting with the end product in mind.