It is not necessary to pose as a passport. Turn around a little, tilt your head or turn away and look at the camera over your shoulder.
It is very important to learn how to look natural in a photo. A strained smile and tension will not make you more attractive.
This will visually rid you of unwanted sides and make you slimmer. Almost all the stars, posing on the red carpet, use this technique.
This will make the face slimmer. And be sure to smile.