Captivity

Captivity symbolizes the strength of love. The speaker imagines himself as a captive to his own love. He feels confined within his "breast," where the heart is located, because he cannot overcome his feelings (2).

Banner

The banner symbolizes triumph and evidence. Armies would use banners to proclaim their passage. Here, it serves as an admission of the strength of the speaker's love, which anyone can see in his face.

Looks

Looking represents sexual desire. In Renaissance English literature, the gaze was loaded with the implication of desire. Lovers shared "looks" that communicated their want for each other, as the speaker tries to do in this poem.