The woman looks neutral in the first shot and then looks happier in the second shot, as the audience associates the dog with happiness and imagines the woman to look happy because of this.
The woman looks neutral in first shot and then looks sadder in the second shot, as the audience associates the rain outside with sadness and imagines the woman to look sad because of this.
The woman looks neutral in the first shot and then looks happier and hungrier in the second shot, as the audience probably associates the food with good feelings and being hungry and imagines the woman’s face to react the same way.