Cyrion

From Author Wars - https://authorwars.com/publications/cyrion-407142.html

Overview:

Title: Cyrion
Author: Tanith Lee
Year: 1993
ISBN-10: 8834703855
Publisher: Fanucci Editore
Price: Lit 18,000
Pages: 303
Binding: Trade Paperback
Type: Collection
Title Reference: Cyrion
Notes: Translated by Paola Gimigliano
Tanith Lee's website (http://www.daughterofthenight.com/tla002.html#A.31) credits this artwork to Achilleos, yet the artwork is the same as Whelan's cover to the limited edition of The Vanishing Tower and is featured on his website.
The cover image also shows the "MW" signature in the lower left corner.