You can be born with great skin and hair — but great makeup? That's on you. (Or, it's at least on the professional makeup artist you hire to apply it for you.)But regardless of how many tutorials you watch or techniques you try, have you ever wondered why you struggle for hours to achieve a perfect cat-eye while your best friend is always rocking a flawless flick? Or why your foundation seems to just sit on top of your face rather than making your skin glow, à la Beyoncé?The truth is, women with great makeup do things a bit differently than the rest of us — and we went straight to the source to find out what those things are. Click ahead to read their tips and tricks, and prepare to take some serious notes.