What is Beauty?

"Beautiful As I Am" by May Faith Photography

Google search defines beauty as 
beau·tyˈbyo͞otē/  noun

1. a combination of qualities, such as shape, color, or form, that pleases the aesthetic senses, esp. the sight.
   "I was struck by her beauty"
   
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2. a beautiful or pleasing thing or person, in particular.

But how do we define it? Especially when it comes to ourselves? Is it hard to tell yourself that you are beautiful? Is it easy to accept compliments? And who really gets to decide what is beautiful?