7 Answers

It's all in your attitude. Have an attitude and personality that attracts people to you, be friendly and helpful and make people feel good when they are around you and they will see the natural beauty of you on the inside and not just your outer looks. 

Natural beauty can also refer to a woman who is beautiful even without make-up enhancing her looks.  

....just be you

....the only One you have to look/behave well for is God

Sorry, you answered your own question. You have to be born that way..."NATURAL". Don't fret, my aunt used to say, "Make up and paint make you what you ain't". Don't despair, looks aren't everything. You can be a beautiful person on the inside. I've known beautiful women who weren't nice, and nice women who weren't pretty at all. https://www.google.com/search?q=lady+gaga+born+this+way&ie=utf-8&oe=utf-8&client=firefox-b-1-ab (Music kicks in at about 2:29).

be yourself.  that's natural and beautiful, even if you look like a frog.

Remember, 'Beauty is in the eye of the beholder' and, to quote another Quote, 'One man's meat is another man's poison'.

Don't worry, be happy. 

Do not use cosmetics that contain harmful substances. Instead have good skincare routine using the natural ingredients. You can cleanse your face by scrubbing aloe vera. wash off with water and use honey as facial mask once a day in a week. Use cucumber slices to get rid of dark rings under eyes. Avoid getting out in intense sun; always wear sunblock cream; choose the best product that suits your skin type.

Get a lot of sleep, drink a lot of water, eat a good diet,  and exercise.