Pick a useful source
Use a recent solo portrait with even light, visible eyes and enough space around your head. Avoid screenshots, group crops, sunglasses, heavy filters and a face that is only a few pixels wide. A friend using a phone’s rear camera can be enough.
Keep the crop flexible
Leave some room above the hair and beside the shoulders. LinkedIn displays the avatar as a circle in many places, so critical details at the square image corners may disappear. Check it at thumbnail size before upload.
Choose attire intentionally
Wear or select a look consistent with your role and market. Plain colors generally keep attention on the face; intricate patterns, oversized accessories and logos can compete with it. If AI invents clothing you would never wear, reject the image.