How does George MacDonald Fraser use imagery in Flashman at the Charge?

Example of Imagery:

"It was a sight I'll never forget. Elspeth was standing by the bed, naked except for her long frilled pantaloons; her flowers were still twined in her hair. Her eyes were wide with shock, and her knuckles were against her lips, like a nymph surprised by Pan, or centaurs, or a boozed-up husband emerging from the wardrobe. I goggled at her lecherously for about half a second, and then realized that we were not alone."