From here you then need to ensure that you pose correctly. A completely face on image can make your neck blend into your chin due to the lack of good lighting and this results in many a passport photo where the subject appears to have either no neck or no chin. Meanwhile looking down will cause you to again expose your head and look as though you have a huge forehead. Any balding on your scalp is going to show up incredibly clearly with this position, and you are also likely to look creepy/intense glaring up from under your brow. Moving your head too far to the side or too far up or down is also not allowed if your passport photo is being used for a professional purpose.

The better option then is to use a technique used by many models and people who pose for photographs regularly. This is to tilt your head slightly back and to one side which will increase the appearance of your jaw line and also creates quite a nonchalant and confident pose. Make sure that this is a very subtle change in your positioning or it will look forced and unnatural, and will do more bad than good for the way your face looks overall.