The artist in your book's version of Rime of the Ancient Mariner is Gustave Dore -- a French illustrator, sculptor and engraver from the 19th century. He was commissioned to illustrate many literary classics, including Paradise Lost, Don Quixote, The Divine Comedy, and of course Coleridge's poem. Click on the picture below to see a collection of his images from the 1876 edition of the poem.