A portrait is a collaboration when a person is identifiable. Ask clearly. Explain the purpose. Accept no as a complete answer. Keep the interaction brief and respectful, and never block a doorway, sidewalk, or business.
Use a simple prompt: “Would you be comfortable with a photo for a learning project?” If yes, show the frame and offer a way to follow up. The skill is not just exposure; it is trust.
That is how a workshop stays community-safe, lawful, and worth repeating.