Since "Chyan" appears to be a typo (likely for or perhaps "Chan" ), and there is no major art program or book specifically titled "Chyan," I have interpreted your request as a review for resources related to drawing and coloring anime characters with a "Cyan" aesthetic (a popular color palette in anime) or general free resources.
Here is a review of the best methods and tools to achieve high-quality anime-style drawing and coloring. drawing & coloring anime-style characters chyan free
While Chyan’s full course is on Coloso , you can find free insights through these channels: Illustrator, Chyan - Coloso. Since "Chyan" appears to be a typo (likely