"Charm is deceptive and BEAUTY is vain, but a woman who fears the Lord is to be praised." Proverbs 31:30
In the discussion this was primarily directed at teaching our girls and so I will begin with that. Women were made in the image of God and in that they are beautiful. Satan attacks the beauty of women. He lies to women about beauty and/or attempts to pervert it. Our culture has bought into his lies and made beauty an outward only and unattainable thing. Instead our beauty comes from within and shines in who we are. As Christians, we are to shine the love of Christ and teach our daughters to do the same.
When teaching our girls about outward beauty we need to teach them what God's word says about beauty and let God and us be their mirror, not the world. We need to direct them in being who God created them to be.
When it comes to sons, we need to also teach them what God says about beauty and what to look for in a wife. We need to teach them to look for Godly character that shines forth in their natural beauty. Having 3 sons I think a lot about this and pray that I model Godly character and beauty as well as teaching them what it looks like in others.