The main difference being that a headshot is a professional representation of the subject for the desired use of the photograph, while a portrait is an artistic representation of the person. A business owner may elect to have a studio headshot taken then have a variety of portraits taken at their place of business.

Set ISO to 100 for the best image quality with shutter speed set to the camera flash sync speed, or a shutter speed close to this: 160/sec – 1/200 sec will be sufficient. Set aperture to f/8 because this will provide the sharpest results for most lenses, and it also gives you leeway to stop down to f/11 if you need to.

You will need medium lighting that allows you to focus on details such as the texture of the skin, lips, and eyes. The fundamental thing is to avoid direct light and stay away from dark spaces. If you decide to take your photo indoors, you can set yourself up next to a window and turn off any lights in the room.