All 5 Uses of

illustrate

in

The House of the Spirits

She was able to attribute her present discomfort to Father Restrepo when he pointed at her to illustrate a point about the Pharisees, who had tried to legalize bastards and civil marriage, thereby dismembering the family, the fatherland, private property, and the Church, and putting women on an equal footing with men—this in open defiance of the law of God, which was most explicit on the issue.
Chpt 1 (definition 1)

illustrate = help make clear

The Jesuit's index finger, which was already raised to illustrate additional tortures, remained suspended like a lightning rod above his head.
Chpt 1 (definition 1) *

Nana dressed up as a headless pirate, as the executioner of the Tower of London, as a werewolf or a horned devil, depending on her inspiration of the moment and on the ideas she got while flipping through the pages of certain horror magazines, which she bought for this purpose and from which, although she was unable to read, she copied the illustrations.
Chpt 3 (definition 2) *

illustrations = drawings or photographs

…river, the pine trees in the forest, and the sprouting stalks of the wheatfields, discussing the virtues of Sinbad and Robin Hood, the bad luck of the Black Pirate, the true and edifying stories from the Treasury of Youth, the worst meanings of the words that did not appear in the dictionary of the Spanish Royal Academy, the cardiovascular system in illustrated plates where you could see a man with no skin and all his veins and arteries exposed for all to see, but wearing underpants.†
Chpt 4 (definition 1)

"Your penis," she replied, for she had seen it in the illustrations of her Uncle Jaime's medical books and on her Uncle Nicolas whenever he walked around naked doing his Oriental exercises.
Chpt 9 (definition 2)

illustrations = drawings or photographs

Definitions:

(1) (illustrate as in: as illustrated by this example)
to help make clear -- typically by example

(2) (illustrate as in: an illustrated children's book)
to draw pictures (or provide photographs) to accompany a book or other writing