Question: Who illustrated the novel in which the fictional location "The Underland" mainly appears?

Context paragraphs:
Land of Toys: The Land of Toys (Italian: "Paese dei balocchi" ) is a fictional location in the Italian novel "The Adventures of Pinocchio" (1883).  It is also known as "Funland" or "Playtime Land."  It is disguised as a haven of freedom and anarchy for boys and occasionally girls.  In the Disney film adaptation of the novel, the land is renamed as Pleasure Island.  The size and nature of such location is unclear (the Disney adaptation depicts it as a large, island-sized amusement park that parallels Disneyland itself, whereas the novel implies it is at least as large as a township); the ambiguity in the original name ("paese" can mean "country" or "land", but also "town" or "village") adds to the confusion.  To its unsuspecting visitors, it appears to be a fantastic place where boys and girls can do whatever they want with no consequences or law.  However, its real use is to de-evolve children for slave trade.

Whale Talk: Whale Talk is a 2001 novel by young adult writer Chris Crutcher.  It is narrated in the first person by the quick-witted, sarcastic, and athletic "T.J." Jones, an adopted Asian-African-European-American teenager living in Cutter, Washington, a fictional location in the Pacific Northwest's Inland Empire, set about 50 miles outside of Spokane.  The novel focuses on how T. J. jumbles together a shabby swim team of student underdogs in order to aggravate and shame his high school's elitist athletics program.

Wuthering Heights (fictional location): Wuthering Heights is a fictional location in Emily Brontë's novel of the same name.  A dark and unsightly place, it is the focus of much of the hateful moil for which the novel is renowned.  It is most commonly associated with Heathcliff, the novel's primary male protagonist, who, through his devious machinations, eventually comes into ownership both of it and of Thrushcross Grange.  Although the latter is by most accounts a far happier place, Heathcliff chooses to remain in the gloom of the Heights, a home far more amenable to his character.

Underland (Narnia): The Underland is a fictional location in the children's fantasy series "The Chronicles of Narnia" by C. S. Lewis.  Described by Lewis as lying beneath the land of Narnia, Underland appears mainly in The Silver Chair, where Eustace Scrubb and Jill Pole travel under the ground to reach it in their search for Prince Rilian.  They find him in Underland and release him from his enchantment by The Lady of the Green Kirtle.

Hell (DC Comics): Hell (a.k.a. Gehenna, Hades, Hel, Jahannam, Sheol and Tartarus) is a fictional location, an infernal Underworld utilized in titles published by DC Comics.  It is the locational antithesis of the Silver City.  The DC Comics location known as Hell is based heavily on its depiction in Abrahamic mythology.  Aside from a brief appearance in "DC Special Series" #8 (1978) that was never referred to or even mentioned again, the DC Comics concept of Hell was first mentioned in "The Saga of the Swamp Thing" (vol.  2) #25-27 (June-August 1984), described by Alan Moore and was first seen in "Swamp Thing Annual" #2 (1985), both of which were written by Moore and depicted by Stephen Bissette and John Totleben.

Rock of Eternity: The Rock of Eternity is a fictional location appearing in comic book stories about or relating to Captain Marvel/Shazam!  published by Fawcett Comics and later by DC Comics.  It first appears in "The Marvel Family" #7 (December 1947) in the story "The Marvel Family Reaches Eternity".

The Silver Chair: The Silver Chair is a high fantasy novel for children by C. S. Lewis, published by Geoffrey Bles in 1953.  It was the fourth published of seven novels in "The Chronicles of Narnia" (1950–1956); it is volume six in recent editions, which are sequenced according to Narnian history.  Like the others, it was illustrated by Pauline Baynes and her work has been retained in many later editions.

Second Son (Child novel): "Second Son" is a short story featuring Jack Reacher, a fictional character created by British author Jim Grant (who writes under the pen name of Lee Child).  It is notable in several ways: in being a short story, as Reacher mainly appears in full-length novels, of which sixteen appeared as of 2012 ; in giving a glimpse of the teen-age Reacher, making the story a prequel set far earlier chronologically than all other appearances of Reacher .  "Second Son" and "Deep Down" were both released originally for the Kindle.  "Second Son" was later included in the paperback and Kindle editions of "The Affair".  "Second Son" was bundled with the movie "Jack Reacher" as a Target Exclusive, when the movie was released on Blu-ray on 7 May 2013.

Welcome to Woop Woop: Welcome to Woop Woop is a 1997 Australian comedy film, directed by Stephan Elliott starring Johnathon Schaech and Rod Taylor.  The film was based on the novel "The Dead Heart" by Douglas Kennedy. " Woop Woop" is an Australian colloquialism referring to a fictional location in the middle of nowhere.

Alba Bouwer: Albertha Magdalena Bouwer (16 March 1920 – 5 October 2010) was a South African Afrikaans-writing journalist and author.  She is best known for her series of children's stories about the experiences of a small girl called Alie growing up in the fictional location Rivierplaas in rural Free State.  Late in life she published a novel for adults, "Die afdraand van die dag is kil" (The close of the day is cold, 1992), about two women in old age.

Supporting paragraphs: Underland (Narnia) The Silver Chair
Answer: Pauline Baynes