This is the original cover painting for the Graham Masterton Omnibus edition of two romance novels: Corroboree and Empress, published by Time Warner  UK in 1991.  (I show the published cover for reference) Beautifully rendered in acrylic and gouache on illustration board , in "wraparound" landscape format, 10.25" x 14.5"  and comes with a label attesting to its authenticity signed by Pether's widow, mounted to the back.  Note the gorgeous depiction of Ayer's Rock in the background - a "must-see" landmark in Australia.