I have an abundant amount of make-up brushes all essential in one way or another to apply make-up from day to day, my favorite set being from www.bhcosmetics.com.
When it comes time for me to apply my face in front of others I'm often asked "what are you using that for?", "Are you supposed to use that on your face?", "How many things could you possibly need?" in which I reply "my face", "yes", and "these are just the essentials". I get crazy eyes from some and confused shrugs from the rest but go on about my business.
It's too much to explain in one sitting but www.maskcara.com managed to easily explain the uses for the essential brushes and trinkets in every girls make-up bag. Here is 'Brushology'..