Having greatly enjoyed Girls Made of Snow and Glass, I was eager to see if Girl, Serpent, Thorn lived up to its predecessor. I was not disappointed.
The characters and setting feel fleshed-out, even if we only get to see them over the course of a few months. The protagonist, Soraya, is easy to come to love. When she makes mistakes, you want to see her succeed and thrive, rather than feel that she deserves the misfortune within her story. There is some tender romance, but that doesn't take the forefront of the narrative.
The writing style is a perfect blend of succinct and descriptive, painting a full and rich picture while not bogging the reader down with excessive visual details -- which is a problem I see often in YA. The pacing is moderate to fast, but it never feels rushed. 
With the story's roots in Persian legend and folklore, Bashardhoust does an excellent job of introducing terms and concepts the Western reader might not be familiar with that fit wonderfully within the world that she has crafted. 
Overall, a well-crafted story and enjoyable read.