In this excerpt from lord byron's "she walks in beauty," which phrases show that byron's subject is rich in kindness and grace?

she walks in beauty, like the night
of cloudless climes and starry skies;
and all that’s best of dark and bright
meet in her aspect and her eyes;
thus mellowed to that tender light
which heaven to gaudy day denies.

one shade the more, one ray the less,
had half impaired the nameless grace
which waves in every raven tress,

or softly lightens o’er her face;
where thoughts serenely sweet express,
how pure, how dear their dwelling-place.

The phrases that show Byron's subject is rich in kindness and grace are:

And all that’s best of dark and bright

Meet in her aspect and her eyes;

Where thoughts serenely sweet express,

How pure, how dear their dwelling-place.

Explanation:

The speaker in Lord Byron's poem "She Walks in Beauty" deeply admires his subject, an unnamed woman whose qualities are only comparable to natural beauties, such as "cloudless climes and starry skies". The speaker uses the harmony between light and darkness to express how graceful her physical appearance is:

And all that’s best of dark and bright

Meet in her aspect and her eyes;

He also admires her for her inner beauty, her kindness and pureness, as expressed in the lines:

Where thoughts serenely sweet express,

How pure, how dear their dwelling-place.

This incredible woman is, thus, the perfect combination of physical attractiveness and good personality. She is kind and graceful, so perfect that any slight change would have "half impaired" such sublimity.