We have spiritual souls, which means we have intellect and free will. We can know Truth, and we can be co-creators with God in the free decisions we make. This is also the basis of personal relationships – probably the fullest sense of image. I think when scripture speaks of God’s emotions, it is talking figuratively. (Emotions or passions implies that the one who has them is affected or changed, but God does not change. Also, animals have emotions so this would not set humans apart as “image of God” is supposed to do.)
BTW, before St. Augustine became Catholic, he used to think Catholics thought that “image of God” meant that God was a giant person in human form, i.e., shape. He thought that this was a silly idea, so he did not look further into Catholic thought, until much later in his life (much to his and St. Monica’s lament). When he did become Catholic, he came to realize his previous preconception was wrong, and that “image” basically boils down to intellect/will. Catholics have been being misunderstood for two millenia.