LADY , thy lofty brow is fair,
Beauty's sign and seal are there;
And thy lip is like the rose
Closing round the bee's repose;
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This is a poem about a painting: it is therefore concerned with a concept rather than with a real person, who in any case remains anonymous.
Another Poetical Sketch of a Modern Picture. I haven't been able to positively identify this painting, which presumably dates from the early 1820s: note in particular the pearls and rubies.