You can judge a book by its cover - this revised axiom is relevant when we discuss the topic of book covers. A Book cover captures the entire book with an image. A book cover designer should practice deep reading to understand the book's contents and design something based on that. The design on the book cover can be a metaphor for the whole book. Since I am interested in designing and playing with colours, book cover design is one area that has fascinated me. Some of my favourite book covers are - Manu S Pillai's The Courtesan, the Mahatma and the Italian Brahmin: Tales from Indian History, Poonachi by Perumal Murugan, The Memory Police by Yoko Ogawa, Silent Travels by Benyamin, Palace of Illusions by Chitra Banerjee Divakaruni, Lolita by Nabokov, To Kill a Mocking Bird by Harper Lee, and Malice by Keigo Higashino.
Examining the book cover of 'At Night All Blood is Black' by David Diop, we are intrigued by the shadowy lean figure of a lone African soldier moving forward with a rifle in his hand. A bayonet is fixed on the gun. He seems to be hunched forward because of the military rucksack on his back. The white circle in the centre represents the moon. The interplay of black and white reinforces the shadowy figure of the soldier. The bluish shades create a contrasting effect to delineate the human shape with the gun.
Jo Walker designed the cover. When I visited the official website of this book designer, I realized that she is the one who had designed the book cover of The Vegetarian by Han Kang. Jo Walker is a professional book cover designer and has more than 20 years of experience designing book covers. She has worked with various publishing houses, including Bloomsbury, Penguin Random House, Granta and Harper Collins. Jo Walker has designed the covers of Chimamanda Ngozi Adichie's four books, including Americanah and Purple Hibiscus. She has created the book covers of the Nobel laureate Doris Lessing (The Golden Notebook) and the Letters to the Lady Upstairs by Marcel Proust.
https://www.wired.com/2014/09/makes-brilliant-book-cover-master-explains/