How does Gustave Flaubert use imagery in Madame Bovary?

Imagery:

“As for the piano, the faster her fingers flew over it, the more he marveled. She struck the keys with aplomb and ran from one end of the keyboard to the other without a stop.”

“The smooth folds of her dress concealed a tumultuous heart, and her modest lips told nothing of her torment. She was in love.”