Summarize the following:
If your subject feels nervous or self-conscious, it will show in the picture. Start with an ice-breaker, like making silly faces or standing in exaggerated poses. Try this while you're shooting your lighting test. Be positive. Most people aren't used to having their pictures taken, so keep your tone encouraging, and keep the conversation going through the shoot. Everyone has gestures and facial expressions which are unique to them. Animated expressions are best for headshots, so talk to your client about different topics to see what they're passionate about, then shoot the results. Ask questions about what the subject likes to do in their free time, as well as their job, their family, and their pets. When you hit on a subject they seem interested in, ask them more about it. For instance, talk to a dog lover about which parks in the city are the most dog-friendly, or ask a music lover about any shows they've seen recently. Share funny stories from your photography experience to put your client at ease. Just be sure to never badmouth a former client - that always comes across as unprofessional! If the energy in the room seems to drop, suggest a wardrobe change or come up with a new pose to shake things up a little. In general, a top-down shot is the most flattering, as it eliminates the look of a double chin. Have the client tilt their forehead slightly forward, which strengthens the look of the jawline. In some cases, shooting up from the bottom can convey strength and authority. Practice a few shots to see if you can find the angle you like. Sometimes, subtle changes can make a big difference. Make slight adjustments to the subject's posture and the angle of their head as needed between shots. Folded arms can convey strength, but it can also look very stiff, especially in women. Try asking them to drop the shoulder closest to the camera for a more natural look. Action shots can demonstrate a person's profession. Show them holding a prop or acting out something they would do at work. Try turning the body to a 45 degree angle with the subject's head facing directly at the camera.

Summary:
Use an ice-breaker to make the client feel comfortable. Try to capture what makes your client unique. Shoot from above the subject for the most flattering angle. Try sitting, standing, and leaning poses to see which look the most natural.