An Enchantment of Ravens
Isobel is the most sought-after portrait painter in Whimsy, a town where mortals trade Craft to the fair folk, who will pay anything for art they cannot make themselves. When Rook, the prince of the autumn court, sits for his portrait, Isobel paints genuine human sorrow into his eyes, an unforgivable insult that exposes weakness in a being who must never appear weak. Rook spirits her away to his court to face judgment, but the journey turns into a flight through a wilderness that hunts them both, with the Wild Hunt at their heels and a Good Law forbidding their growing feelings on pain of death.
Where An Enchantment of Ravens keeps showing up
One of our editors' lists features this novel.