So they have published a neat and simple trick to make your digital images resemble what you see in the mirror.
Just open the image file in any graphics editing softwae, flip the image horizontally and make a selection that you want in the final printed copy. Google Picasa can do this for you and it will also save a copy of your original photograph.
A simple trick that we all are aware of but never tried it.
Related: How to look more attractive in Photographs
Photoshop Facelift has a detailed tutorial on creating a symmetrical face by adjusting the photo in Photoshop.
Source: Self-Portraitist: Tricks of the Trade