Smiling comes naturally to some and less easily to others, but it is a simple gesture that can steer us clear of self-pity and a downward spiral and an act that is contagious to our children. They will catch and mimic what we model, so we should be conscious of our expressions.
Consciously choose the emotions you display, and the outward act of the will can work its way inward to change your actual emotion.
A smile is a simple way to love someone else, to offer approval, acceptance, and affection. It is a gift to your children that gives back to you, also.