Why do I look okay in the front camera of my iPhone but bad in the back camera?

I kinda look good in the front camera of my iPhone but I have noticed I don't look that "great" in the back camera of the phone.
My face looks longer and my smile is bigger? It's kinda weird. But in the front camera i kinda look like the way I see myself in the mirror. But why do I look good in one camera but bad in the other if they're both cameras?

If you mean the Facetime camera above the screen makes you look bad, it's because that's a much lower resolution (the amount of detail in the picture). The main camera (the one that normally faces away from you) on an iPhone 4 has more than 20 times the pixel count of the Facetime one.

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