For instance, here's the painting resulting from Lorenzo Costa's drawing of the coronation of the Virgin -
Note the saints looking up at the heavenly scene. (St Victor, St John the Baptist, St Augustine, St John the Evangelist, St Jerome and St Sebastian.) Why is one of the reading rather than looking? to show that "some people are non-believers and don't see a miracle when it happens before their eyes".
I have been collecting the image lists and taking notes and making sketches, and hope to review the material and find images of some of the drawings when things settle down a bit here.
Short video featuring the course tutor is here.