This painting is called Titania. It was painted by John Simmons, 1823 - 1876.
John Simmons was British by birth. He is best known as one of the Victorian Fairy Painters, a group which includes John Anster Fitzgerald, Thomas Heatherly and John Atkinsin Grimshaw. His paintings usually show a single nude female figure in a natural setting.
This painting hangs in the City of Bristol Museum and Art Gallery, Bristol, England.