'The mystery cover art shows a strapping centaur with delicate wings flying above a menacing green face with bright red eyes. Craggy mountains and fluffy dark clouds surround the haunting figures. The website Book Riot called the art “nightmare fuel.” The artist’s name isn’t mentioned anywhere in the book.'

https://www.nytimes.com/2023/09/06/books/wrinkle-in-time-book-cover-artist.html