Find a location with good light for a portrait shot. Place your subject some distance in front of a simple background and select a wide aperture together with a moderately long focal length such as 100mm on a 35mm full-frame camera (about 65mm on a cropped-frame camera). Take a viewpoint about one and a half metres from your subject, allowing you to compose a headshot comfortably within the frame. Focus on the eyes and take the shot.
Camera set at ISO 400, FL 20mm, 1/2000th @ f4. Even though I was standing at 1.5m distance the 20mm FL allowed enough of the background to become part of the photo lending to a more pleasing backdrop.