These are novel illustrations that were included in volume 4:
Front cover & insert
Back cover & insert
Front page (page 001)
Character cast (page 002)
Foldout 1 (page 003-005)
Foldout 2 (page 006-008)
Page 009
Page 026
Page 065
Page 068
Page 131
Page 148
Page 167
Page 179
Page 191