Pay attention to the way a person's outward appearance, even their face, will change as you progress in a relationship.
With people you have loved for a length of time, you may not notice how your love for them colours the way they appear to you until someone forces you to try to look at them dispassionately.
As an example, an acquaintance might comment on the physical resemblance a loved one bears to some famous person.
It may be shocking to note that your loved one does look like someone whose appearance you never much cared for!
What then are our eyes seeing when we look with love, that they do not see otherwise?
Eyes of love see more, not less.