When you share your last crust of bread with a beggar, you mustn't behave as if you were throwing a bone to a dog. You must give humbly, and thank him for allowing you to have a part in his hunger. ↗
Think about the photo before and after, never during. The secret is to take your time. You mustn't go too fast. The subject must forget about you. Then, however, you must be very quick. ↗