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The "deer in the headlights" look can make you look a little frightening. The quickest way to make any portrait look better is to ever so slightly squint your eyes. Be careful not to squint so much that it looks like you're straining to see something, however. There's a reason almost everyone hates driver's license, passport, and other ID photos. Looking straight-on, stiff, and wide-eyed at the camera just isn't flattering. Before snapping your picture, show off your best side and tilt your head slightly. A smile improves any picture. Studies show that a smiling face appears more likeable than one with a neutral expression. Relax your mouth, show a few teeth, and smile naturally. Try to avoid the clenched, cheesy smile. Pouting out your lips in an unnatural way, or any other unusual expression will lower the quality of your profile picture. Over-the-top expressions can make you look silly and obscure what you really look like. You want people to be able to match your profile picture with how you normally look. A profile picture should focus on showing your features as they naturally are. If you do your makeup, wear bright lipstick and make sure your eyebrows are perfect so they will enhance your expression. Take off sunglasses or anything else that might obscure your features.
Squint a little. Tilt your head to the side. Show your pearly whites. Avoid the duck face. Keep things natural.