Read it through once

Imperceptibly I became conscious of a change in Biddy, however. Her shoes came up at the heel, her hair grew bright and neat, her hands were always clean. She was not beautiful,—she was common, and could not be like Estella,—but she was pleasant and wholesome and sweet-tempered. She had not been with us more than a year (I remember her being newly out of mourning at the time it struck me), when I observed to myself one evening that she had curiously thoughtful and attentive eyes; eyes that were very pretty and very good.