Answer:
The comparison of her smile with 'Mona Lisa' helps visually represent the idea/image of happiness.
Explanation:
Figurative language is characterized as the use of a language(words and phrases) which convey a more powerful and effective meaning beyond their literal meaning. It involves the use of imagery, metaphor, simile, hyperbole, etc. which allows the readers to visualize, associate, or develop other effect in their mind beyond the basic/literal meaning of the words.
In the given sentence, the comparison between 'her smile' and the 'smile of Mona Lisa' represents the 'idea of her happiness.' <em><u>Mona Lisa's smile was enigmatic and ambiguous at the same time and thus, the author suggests the similar idea and leaves it to the readers interpretation and allows them to visualize and associate to it accordingly</u></em>.
