Final answer:
The provided text excerpts do not contain any information regarding the look on Roberto's face according to Larissa, as the texts do not reference a character named Roberto in the context of being released. Without additional context from the text, it is not possible to answer the question accurately.
Step-by-step explanation:
The text provided does not give a direct answer to the question about the look on Roberto's face when he was released as it does not reference a character named Roberto in the context of being released. However, there is a mention of a de la Vega being released, but the description of his feelings or expressions at that moment is not provided in the provided excerpts. Therefore, we cannot accurately answer the question about what the look on Roberto's face was when he was released according to Larissa without more context or information from the text.