This is what research says about your 'brightest side'.
Chances are you find the left side of your face the most attractive. There's a reason for this:the left side of your face is controlled by your right hemisphere. The side in which your emotions are controlled. Funny thing is, when we look at other people's photos, we apparently prefer to see the left side of someone's face too. To reach this conclusion, thousands of selfies have been studied. We immediately know why in the group photos with friends everyone is turning the same side to the camera.