“A photograph that one has taken of oneself, typically one taken with a smartphone or webcam and uploaded to a social media website.”
The fact that ‘Selfie’ has made it into the Oxford Dictionary, means it is well and truly established in popular culture. Selfies can be taken anywhere, at any time by anyone. Even, believe it or not, at funerals. http://selfiesatfunerals.tumblr.com/
A hair selfie could be a great marketing tool to get new clients into your salon. Ask you clients to take a seflie, showing off their new hair cut or colour and mention your salon in the comment or even better, use geo-location so their followers can find where you are on the map. Once your client posts it onto their social media platforms, it’s a free marketing tool for you. And what do they get out of it? You could offer them a discount off their next visit or a free ‘selfie treatment’. Oh, and don’t forget to repost any selfies yourself so your existing followers can see your work.