How about your supposed viewers? When your book is YA, function which has a designer who has experience with YA covers Even now, when you want to find bestsellers which have been executing very perfectly within the Indian market then You will need to evaluate Rupa Publications. Eureka bookstore is https://whitemagicstudios.co.uk/blog/how-to-hire-the-best-book-illustrators-book-cover-designers/