Solomon makes an important observation about the importance of your facial expressions.
"In the light of a king's face there is life, and his favor is like the clouds that bring the spring rain." (Proverbs 16:15)
In countries ruled by kings, a king's smile was a big deal. A king had absolute authority. He literally had the power of life and death. So, the smile of the king was a welcome sight to his subjects. In Israel if the spring rains failed to come then the crops would fail and there could soon be famine in the land. The king’s favor was like the welcome rains of spring. His smile meant life.
You may not be a king. Still, Proverbs 16:15 is a reminder of just how important your countenance is to your children. For example:
"What's wrong, Mommy?"
"Nothing, dear. Why did you think something is wrong."
"Well, you don't look very happy."