In this excerpt from "The First Snowfall" by James Russell Lowell, which lines contain figurative language?

The snow had begun in the gloaming,

And busily all the night

Had been heaping field and highway

With a silence deep and white.

Every pine and fir and hemlock

Wore ermine too dear for an earl,

And the poorest twig on the elm-tree

Was ridged inch deep with pearl.

From sheds new-roofed with Carrara

Came Chanticleer's muffled crow,

The stiff rails softened to swan's-down,

And still fluttered down the snow.

I stood and watched by the window

The noiseless work of the sky,

And the sudden flurries of snowbirds,

Like brown leaves whirling by.