Why does Pound, in “In a Station of the Metro”, compare ‘Faces in the crowd’ to ‘Petals on a wet, black bough’?

Question

Imagist poetry continues to influence poets today. The primary poets of this movement were: Ezra Pound, Hilda Doolittle (HD), William Carlos Williams, and Amy Lowell.

After reading “In a Station of the Metro” by Ezra Pound (1885-1972), and “The Red Wheelbarrow” and “This Is Just to Say” by William Carlos Williams (1883-1963),

Answer 1

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maybe faces in a crowd all blend in together and are hard to see just like petals (leaves) that are wet on a dark tree. They kind of blend into the tree like people waiting for a train blending into each other or the background of the station wall