I've always liked the CreatureBox team of Dave Guertin and Greg Baldwin. Creators and concept artists for the Ratchet and Clank game series, but they've worked on other character designs projects as well. They seem to specialize in creatures and monster designs.
Wow, those Kekai Kotaki and Ruan Jia are great! *yuralock's art is amazing too!! ~Rahmatozz's designs are incredibly detailed! I really love them! I knew (and love) the others! Thanks for the suggestions!!!