I'd never heard of her, but her art is nice. The authors credit her, as they should, and that should be enough as we're only talking about inspiration here.
It's hardly ghoulish to make new works in the style of a late artist, when you're open about what you're doing and giving credit.
I keep seeing artist use acrylic paint, such a blatant rip off of long established art styles. This has to stop.
EDIT: let me take this opportunity to also point out how better copyright enforcement could have saved us from the likes of this fraud Picasso, who just ripped off the style of Braque
It's hardly ghoulish to make new works in the style of a late artist, when you're open about what you're doing and giving credit.