We can stand in front of a mirror brushing or combing hair, massaging or working in gel, and (usually women) applying make-up.  We can picture beauty or attractiveness in our minds ...and try to duplicate what we imagine by what we perceive ourselves to be, or want to be. 

We may also practice smiling.

Or we can stand in front of a mirror ...and suddenly rough-up our hair, and frown.  We can imagine what others may think if they see us sad.  We may even see the mirror as a testing ground of how good we are at depicting these various emotions ...conducting our own audition.  We pay close attention to whether others respond the way we would like them to.

Or we can just be silly, and either primp or clown ...and take countless selfies, perhaps downloading them to Facebook to see how many 'like's we can get.