Looking at the images in McGrath's links, I wonder again at how people know that a particular image is of Mary. Who is to say that it is not an image of my neighbor, Jane Doe, or my Aunt Edna? Or maybe the Virgin Mary's best friend? The same question arises in connection with Jesus. What makes people so sure? I remember a water-stain image on the wall of a highway underpass. Even assuming one can see or visualise the image of a human being, what makes anyone say it must be of a historical figure, much less Jesus?

By the way, in McGrath's link, the painting of the Weeping Virgin Mary shows fully grayed hair; nothing blonde about it.