Use a tripod and, ideally, a remote release so you’re not racing a self-timer. If your camera supports it, tethering to a computer helps a lot because you can review framing and expression immediately.

For a flattering headshot, keep the setup simple: plain background, soft light, and avoid on-camera flash. A shallow depth of field can look very nice, but it makes focus harder, so be sure the eye closest to the camera is sharp. Pre-focus where your head will be, then take many frames while making small adjustments in distance and pose.

For posing, use the side you think looks best, keep your posture upright, and relax your expression—aim for a natural look rather than an exaggerated smile. Slight experimentation with camera height and head angle is worthwhile; shooting a bit from above can be flattering for some people.

Since you’re both photographer and subject, expect some trial and error. Try multiple angles, expressions, and both light and dark backgrounds, then choose the version that works best once converted to black and white.