From a set of really cool book illustrations from 1923. According to the blog, the artist did a lot of work for low-rent pulp #scifi too.
The style reminds me of #ArtNouveau, but I'm way too amateur to make that classification...
Many more are shown here (contains stylized nude figures):
https://www.johncoulthart.com/feuilleton/2025/10/06/elliott-dolds-night/