Unofficial line up for picture book

The unofficial designs for the main characters of the picture book I'm doing this semester for my narrative illustration class.  The story is a retelling of the Chinese folktale "The Four Dragon Kings."  So these are the four kings, Ao Chun, Ao Chi'in, Ao Jun, and Ao Kuang, and the Jade Emperor.
Art and character designs are copyrighted to me. :)