Dema's Riddles #1

• Artist: ROOTdemacry
• Description: The answer is:
  
  
  
  
  
  
  
  
  I am a mirror
• Date: 03/31/2012
• Tags:

Mine is the face that holds the world,
My expressions change with every angle.
I am the favorite mate of my vain companions,
My shallow traits hidden from them.
What am I?