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Consider this image of one of the world's most famous faces - Leonardo da Vinci's Mona Lisa. Which version do you prefer - the one on the left or right? 90% prefer the one on the left - the way she was originally painted.
Quite simply, your face is the wrong way round.
About 90% of people will say they hate having their photo taken and are the least photogenic person in their family (if not the world).
When you flip the image of someone on a computer, most people prefer it.
We have spent our lives seeing our faces in the mirror, and we have become used to seeing our face that way round. So when we reverse that image, it doesn't look right.
No one has a perfectly symmetrical face.
Most people part their hair on one side rather than the other.
Most people have one eye slightly larger than the other.
Most people have one curvier eyebrow and one straighter or pointier.
Most people smile slightly more out of one side of their mouth than the other.
Most people have a mole, scar or facial feature on one side and not the other.
And so it goes on.
So if your nose goes 2mm to the left, then when your image is the other way round it appears to be 4mm to the right of where you're expecting it to be.
When you add all these things together, when you see your face in reverse to how you expect it to be, it's you, but not you. And that makes you feel uncomfortable.
An image (original and flipped side by side) of someone no one knows, one would get a 50/50 split in preference.
And that's because most of us are more far more comfortable with what's familiar.
So when you look at a family photo, or group shot, everyone else looks as you expect them to - the way you see them every day. But you don't. Your face is the wrong way round to what you are expecting. So you think you are the unphotogenic one.
Meanwhile, everyone else is thinking exactly the same thing. So when you say to your sister - "you look great, but I look awful in this" - she thinks you're crazy, because to her you look fine and she thinks she's the odd looking one.
Find a photo of yourself and hold it up in the mirror - look at its reflection. And if it looks better to you that way round, it will look fine to everyone else the normal way round.
Abraham Lincoln the way we are used to seeing him
How he used to see himself everyday in the mirror
This is a direct example of the Mere-exposure effect. The mere-exposure effect is a psychological phenomenon by which people tend to develop a preference for things merely because they are familiar with them. Basically we are so familiar with ourselves looking like the way we look in mirrors, we seem to look different in photographs.