Is “image and likeness” a redundant phrase, or does it mark a distinction? Arguably the latter. To be created in God’s image is to be granted the potentiality for sharing in the divine life, a potentiality that may or may not be actualized and is shared in equally by all human beings without their consent. Likeness, however, results from man’s free actualization of that potentiality. Whereas the image of God is imposed on man, likeness to God is not, but requires the free cooperation of the creature.
— Bill Vallicella (via)