Author's Tone

Wilde was very much a social commentator, so I think that gives the novel a sort of pedagogical tone in places. He had a lot to say and a lot to impart to the reader about what he thought about society and the like. In many ways, "Picture" was another sad, ironic story, just like his short stories and children's fairy tales.

Then again, Wilde was attempting to write a new kind of novel in accordance with his beliefs as an Aesthetic. He was a great believer in beauty for the sake of beauty and in art for the sake of art--he wanted to write something that was beautiful--tragic, perhaps; immoral, perhaps, but beautiful.

Definitely go back and reread the preface of "Picture" for insight; it's purely Wilde speaking to his readers and critics. Compare it with the body of the novel and take note of any differences in the way the story is presented (or it's tone). That will give you a place to start, at least.