Dark Souls: Astora by Yang ShaoXuan, page 120 and Melfia by Vincent Létang, page 118

Astora by Yang ShaoXuan (Instagram) is featured in Soul Arts on page 120. Melfia by Vincent Létang (Artstation) is featured in Soul Arts on page 118.

Both artworks feature small circles that could be the inspiration for the small circle in the Dark Souls pattern on the endpapers.