I think the heart pendant really pulls the full outfit together! I was kind of iffy about her design before but I really, really like how she looks here.
I like her bold, long eyelashes that reach all the way to her temples. And lifted up, asymmetrical bangs. The combination of those things gives her a distinctive look to her face.
I also really like how her hair billows outward at the sides, making for kind of an inverted heart shape to her head, visually mirroring her pendant. It gives her a more interesting silhouette.