"Manga Art by Mark Crilley: Inspiration and Techniques from an Expert Illustrator" is a book that provides insights and tutorials on manga illustration techniques by renowned artist Mark Crilley. The book is focused on manga as a genre and showcases the author's expertise in the field of illustration. With a visually illustrated format, readers can learn from the examples and instructions given by the author, making it a valuable resource for those interested in improving their manga illustration skills.