Is it a published work or you want to discuss some writing work in progress?
If you want to discuss something about writing, you should try:
https://animebase.me/forums/writers-club.35/
If it's some kind of graphic novel/ story cartoon or manga style book you can make your thread here:
You can post about your book in
The Library section ( Link here). That is if it's a published book.
Advertising is strictly prohibited unless allowed by the Founder: Zise or Versuvio. So you can mention where to read or buy them from in your post as long as it's not an illegal site. But avoid hotlinks and do not cross post in more than one section, nor make multiple threads about same book.