How does Virginia Woolf use imagery in Flush: A Biography?

Imagery:

"Between them, flush felt more and more strongly, as the weeks wore on, was a bond, an uncomfortable yet thrilling tightness; so that if his pleasure was her pain, then his pleasure was pleasure no longer but three parts pain."

"'Flushie,' wrote Miss Barrett, 'is my friend—my companion—and loves me better than he loves the sunshine without.'"

"So a savage couched in flowers shudders when the thunder growls and he hears the voice of God."