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The appearance of Justine was calm. She was dressed in mourning, and her countenance, always engaging, was rendered, by the solemnity of her feelings, exquisitely beautiful. Yet she appeared confident in innocence and did not tremble, although gazed on and execrated by thousands, for all the kindness which her beauty might otherwise have excited was obliterated in the minds of the spectators by the imagination of the enormity she was supposed to have committed. She was tranquil, yet her tranquility was evidently constrained; and as her confusion had before been adduced as a proof of her guilt, she worked up her mind to an appearance of courage. When she entered the court she threw her eyes round it and quickly discovered where we were seated. A tear seemed to dim her eye when she saw us, but she quickly recovered herself, and a look of sorrowful affection seemed to attest her utter guiltlessness. (8.2)
Ooh, complicated. Justine is pretty, which would normally make people like her—except that, in this case, they think she's a monster. She's acting calm, because acting confused made people think she was guilty—but trying to appear calm just makes her look, well, stressed. It looks like judging people based on their appearances isn't as straightforward as it seems.