See also "What a Deep Neural Network thinks about your #selfie" at http://karpathy.github.io/2015/10/25/selfie/ . To summarise the "What makes a good #selfie" section:
- Be female.
- Face should occupy about 1/3 of the image.
- Cut off your forehead.
- Show your long hair.
- Oversaturate the face.
- Put a filter on it.
- Add a border.