Characters studies for the manga

Source - Artbook Lost Angel:

 

Source - Manga (chapter and volume comments):

 

Study for the anime (Kaori Yuki)

Source - Artbook Lost Angel:

 

Study for the anime (character designer Minako Shiba)

Source - website of Centralpark Media (first distributor of the DVD in the USA, defunct):

 

Source - Booklet of the OVA French collector DVD by Kaze (distributor of the DVD in France):