Mike Schley is the artist who illustrated the map of Pyrrhia, although the original sketch was done by Tui T. Sutherland. You can visit his website at mikeschley.com.
Mike Schley also illustrated the updated map for books six through ten, the second arc of the Wings of Fire series, and again- a different one for Darkstalker (Legends).
Map for books 1-5, by Mike Schley
Map for books 6-10, by Mike Schley
Map for Darkstalker (Legends), by Mike Schley