People always need to know the use of such pictures and in fact there are sufficient reasons:
It's Fun!
It's interesting to see your own aura.
You'll be more aware of your feelings and thinking.
You learn to balance your energy field and stay healthy.
You can follow a therapy course, specially therapies in sensitive areas like Reiki, Spiritual Healing...
It can help you to open up when you see the aura with your own eyes.
Seeing your own aura is like seeing a mirror of the inner feelings and sensitiveness this often gives us a desire to change.
GENERAL ANALYSIS OF AN AURA PHOTO!
Just taking a nice aura photo is not enough - of course the interpretation of the aura photo is the most important part. To read an aura photo you have to consider its many different parts:
The shape of an aura
The energy positions
The colours of an aura
ON AN ORIGINAL AURA-PHOTO IT IS POSSIBLE TO HAVE COUNTLESS COMBINATIONS OF DIFFERENT COLOURS & SHADES!