As a middle school teacher I'm always looking for books that I can recommend to students. In particular, I look for books that are thought-provoking and that provide positive depictions of girls/women and LGBTQ people.
Echo is creative and a hard worker. She is driven to succeed in her chosen field (fashion design) and we see her working on her designs, networking with other designers, and promoting her work and the work of others. It's rare to see talent depicted in this way in YA books and I think it makes the character more realistic.
I also liked Echo's friends. You really get a sense that they are individuals and, even though they are concerned about Echo and rally around her when she needs them, they aren't just a backdrop for the main character.