Looking good in pictures...

[Alex]

Show good posture. If possible get the camera a little above your face (this will lengthen the neck and pull the skin tighter). Use fill lighting so your whole face is visible and if possible use indirect lighting rather than a straight on flash.

Bug eye a little bit. Not open as wide as possible but generally a little bit more open than normal.

If you're not smiling in the picture, keep your mouth close but not tensely so.

But really, lighting is probably the most important thing. But in this digital age, get a friend over and just take dozens and dozens of pictures. Pick the ones you like and then start tweaking that pose and composition until you find something you really like.