The face most pleasing to the eye is the one most symmetrical. Eyes a different size, an upturned lip or a crooked nose detracts from what we call beauty. Of course God doesn’t make the two sides of our faces exactly the same.
Cutting a face in half and placing it beside its mirror image is simple enough in Photoshop, but it looks fake. To make it look real, one must create subtle differences to the two sides, like this:
To see an instruction video that inspired me to try this technique, click here. At left is the original image from which the glamour shot was created.