>>3830985
Just found it in a twitter post here, along with another piece of art I don't recognize.

https://x.com/tomaayu/status/1825750995869274370

The tweeter says the artist is Yuko Ishizuka. Googling the name only turns up a couple of listings for a Romancing Saga 3 guide they also did art for. Looks like I've got more hunting to do.