Choose an observation
Look for a repeated relationship such as people and signs, reflected movement, or changing shadows. A specific question gives your walk structure without requiring strangers to perform for you.
Respect the situation
Consider vulnerability, privacy, and the effect of your presence. When appropriate, ask permission or make a different photograph. A technically possible picture is not automatically a considerate one.
Edit beyond the single frame
Sequence images to show variation in your chosen observation. Remove photographs that rely on a caption to turn an ordinary gesture into a misleading claim.