Pretty... Pretty is as pretty does.
When I was younger, I heard my grandmother say this, and countless others...and knew they were advising me to behave properly, be nice, be polite, smile and say please and thank you, etc. etc. etc.
"The Lord does not look at the things man looks at. Man looks at the outward appearance, but the Lord looks at the heart." 1 Samuel 16:7
I've spent the last 35 years doing what I can do to improve appearances. Shaping a haircut to compliment and balance a face, using color to brighten a face, covering up the natural signs of aging (gray hair!! shudder.....)
I've practiced my craft, I've gotten a lot of education, know a lot of 'stuff' about what I do, how to do it and why. But only the outward appearance is changed. And while it is true that the outward appearance affects the way we feel about ourselves, it doesn't really change anything that is inside us. It doesn't change who we are.
I can change appearance, but only God can change a heart. And He is so very good at what He does.