Hannya Reference is a collection of 35 contour-line drawings of a hannya mask created in 2011. The spiral bound book is intended to help artists visualize and render the hannya mask in proper proportions based on these 35 different viewing angles. Each line drawing is accompanied by four possible lighting scenarios.

"Once again, the illustrious and enigmatic Matthew Amey brings you a must have tattoo reference book of the dark, sublime, and very complex hannya mask." -- Jay Cooper

This collection of drawings are similar in scope to the drawings found in the skull reference book. However, in addition to the line drawings, this publication includes four different lighting situations, per drawing, giving form and depth to each. A total collection of 175 different possibilities for one mask!