Pixiv is a community that makes it easy for illustrators and illustration enthusiasts to communicate with each other through their content, and which allows users to post their own illustrations.
The illustrations that you post and bookmark form your profile, and users communicate with each other, with the content of their profiles at the center of their discussions.
Illustrations with large variety of genres are uploaded to pixiv. The community is also frequently used to hold both user-organized contests and the official contests of manufacturers as well. The community is also used as a co-creation platform, where users collaborate with each other and new content is born.
Registering with pixiv is free. It’s also free to use.