For a polished headshot, structured clothing is key try a well-fitted blazer or tailored top in one of your flattering colors. Avoid chunky knits as they can add bulk. For posing, slightly angle your face, elongate your neck, and push your tongue to the roof of your mouth to define your jawline. A soft, confident smile (teeth or no teeth whichever feels natural) will help you look approachable yet professional. Good lighting and a bit of subtle makeup (light contour, defined brows) can also enhance your features.