mirror,mirror. What is real? - Page 2
To be pedantic, it's the jaw that makes the teeth "off."
It's mostly natural although lighting and makeup can embellish. In cinema you will hear,"the camera loves her" or "she's got great bones". It's true. A friend once introduced me to Michelle Pfeiffer, who is known to have one of the most photogenic faces in the history of cinema, and I must say that she looked rather plain in person. After meeting her I expressed that sentiment to my friend, who is in the movie business, and he said," Yes, but the camera loves her".
What do you mean by accuracy here? To me it means how natural is your presentation. Both of means that you've mentioned - mirror as well as photo are ways of presentation. In the mirror you might not smile or you might smile unnaturally - maybe in social contexts (the pics, I assume they're from those) you smile naturally and that makes your face look a bit different. The mirror would be more atypical way of how your face is presenting itself, and hence "inaccurate".