Mary Grandpre —

Mary GrandPré is an American illustrator best known for her cover and chapter illustrations of the Harry Potter books in their U.S. editions published by Scholastic. She received a Caldecott Honor citation in 2015 for illustrating Barb Rosenstock's The Noisy Paint Box: The Colors and Sounds of Kandinsky's Abstract Art. GrandPré, who creates her artwork with paint and pastels, has illustrated more than twenty books and has appeared in gallery exhibitions and periodicals such as The New Yorker, Atlantic Monthly, and The Wall Street Journal... (wikipedia)

It's like a candy store for an illustrator, I connected with Harry pretty quickly and loved the way J.K. described everything; she's such a visually thinking person. You can't pass that up.
I will be sad. I've gotten very attached to Harry and all that goes on in his world, I guess I'll just be kind of tasting every bit of it because it will be the last one.
In creating the Harry Potter artwork, I try to bring a certain amount of realism and believability to the characters and setting, but still add an element of wonder and the unknown.
I get to show the reader the essence of the book without giving anything away.