A review by books_are_nice_and_enjoyable
Yumi and the Nightmare Painter by Brandon Sanderson

4.5

A quote from the postscript:

"It's not something we see enough in fantasy - people with jobs that are suited to the specific style of worldbuilding done in the story. For years, I've wanted to write a book focusing on the everyday duties of people who had a job in a fantasy world. A job that - to them - was normal, but which would seeem strange to us as readers."

This aspect, in combination with the romantic dimension he also touches upon in the postscript, makes this book work. It's slow to get started and it's somewhat dark and oppressive given the setting, but it needs to be in order for that particular story to be told. 

It's a very fine book.