After years, I finally got the library to request a copy of Kay Nielsen's book of children' fairy tales,
East of the Sun and West of the Moon. The stories are dismal, and I can't even tell if Nielsen is supposed to be the author. But the artwork is fascinating.
Nielsen was a Dane, born in 1886, who also lived in the U.S. at some point.
https://en.wikipedia.org/wiki/Kay_Nielsen
His art is very mannered, with elongated figures that supposedly derive in part from Beardsley
https://www.art.com/gallery/id--a372...ey-posters.htm
but also remind me of the artwork for the Elric fantasy series by Michael Moorcock.
https://images-na.ssl-images-amazon....,200_QL40_.gif
Here is some of his art:
https://www.wikiart.org/en/kay-nielsen/