Most of the characters in the first book are one dimensional, they're not alive long enough to be otherwise. At least with Foxface we get a couple of cute/trickstery moments. And she's one of the only tributes that gets named early on, so she's kind of with us the entire time. As oppose to say Clove, who is named late and our connection with her is more disjointed.
And I don't mind the look of her actress. Her face looks pretty foxy to me! Although the first person I though of for the role was Emma Stone:
But I'm sure it was a conscious decision to go with relative unknowns for the tributes.
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http://img.imgcake.com/crimjpgpe.jpg Mo' buildings mo' problems
ocean kinda grew on me like a flesh eating ...fungus. -BIGPUN9999