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.
Astora by Yang ShaoXuan p. 120
Both artworks feature small circles that could be the inspiration for the small circle in the Dark Souls pattern on the endpapers.
Melfia by Vincent Létang p. 118