Answer: The words that you may choose are "ravished" and "ecstatic."
Explanation: Just to elaborate a little on the answer, it can be added that the tone refers to the way in which the author approaches the subject matter or theme of his or her work. As a result of having chosen a specific set of words to describe the character's reaction in a particular way, such as the adjective "ravished" (which can be translated as "overcome with emotion"), the author has contributed to create an enthusiastic tone, which reflects the positive effect that having seen a certain person had on the character. Likewise, the adjective "ecstatic" contributes to emphasize the meaning of the excerpt, which revolves around the enthusiastic and euphoric response that Felix had when he saw her.