How to view people with metta and karuna?
Metta is wishing for all beings to be happy and be at ease.

Looking at women as mothers is not metta.

But I can find a reverse-mother reference for metta below.

The metta practitioner should feel loving-kindness towards all beings just as a mother would want to protect her only child.

Metta can be used to counter one's own impulse to cause harm or unhappiness to others by considering the welfare and happiness of others.

From the Karaniya Metta Sutta:


  As a mother would risk her life
  to protect her child, her only child,
  even so should one cultivate a limitless heart
  with regard to all beings.
  With good will for the entire cosmos,
  cultivate a limitless heart.