Tone in literature is the writer's attitude toward the subject in question. In this poem, the speaker's subject is a beautiful woman he sees and admires. His tone is one of deep, sincere, and heartfelt appreciation of the perfect womanhood she represents to him.

Words convey tone, and the speaker uses positive and idealized terms to describe the woman he sees. He compares her to nature, likening her, with her black hair and shining eyes, to a starry night sky. He also uses superlatives to describe her, such as the word "best," when he states that she represents "all that’s best" in beauty through the combination of her dark hair and bright eyes.

Romantics often tried to portray nature and people in their best light, to convey the ideals we might aspire to rather than simply record reality. Byron's tone communicates this Romantic preoccupation. Not only is the woman beautiful in physical appearance, but her soul is lovely as well. He uses terms like serenely, pure, sweet, goodness, calm, and innocent to describe her. These are all abstract terms that leave it to the reader to fill in the details of her body and soul but, at the same time, impress the reader with a glowing feeling about the woman as an exemplar of all that is finest in womanhood. The poem ends on an ecstatic note—with an exclamation point—as the speaker ends a string of praises with

A heart whose love is innocent!