The image of this c. WWI British nurse was captured in a beautiful English garden - far away from the killing fields of Belgium and France. She is possibly the daughter or wife of a wealthy or titled Englishman who is doing her patriotic duty by becoming a nurse to care for the vast numbers of sick and wounded British soldiers.
On the other hand, perhaps she is a middle-class woman working as a nurse at a large English country estate, where the manor house has been converted into a military hospital.
At her side is a beautiful dog with intelligent eyes. I am not real certain, but I think it is possibly an Irish Wolfhoud. Usually they are HUGE dogs, but perhaps this dog is a female that is on the small side.