I quite like it. It has a bit of a different feel and mood to the usual Miu Miu ads to me. I do think Hailee was a good choice for the brand personally.
It's a sad looking photo. It reminds me of those children who get put into really expensive and strict boarding schools, where they're dressed really adult (like this) and never develop a fun childhood. Then when they're older they look at kids in the park (like this) and feel sad because they never had the same thing.
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"I'm not sorry... I'm sorry that I didn't make it clear that it was a joke. But I can't be sorry for what I said—it's against my nature." Lars von Trier