This sentence looks like an interrogative sentence, but how does it express exclamation?
This sentence is exclamatory based on the tone and inflection in her voice which expresses exclamation and urgency. Exclamatory sentences are interrogative sentences with more emotion and exclamation involved. So the question "are you handsome?" here is interrogative, but it is said with such emotion that it indicates exclamation and can be noted as such with an exclamation point (!).