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Some good basic tips indeed, but remember that a passport photo is a very specific picture taken for a very specific function (visual identification). There is no room in a passport photo for artistic flair.

A flattering portrait and a functional passport photo are two different photographs taken for two entirely different purposes.
 
I'm pretty sure the standards for government photo I.D. are:
Learner Permit - Look Bewildered
Drivers License - Look Hung Over
Passport - Look Like Rapist

At least, that's what they achieved with me. :D
 
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