henry singleton was an english painter and miniaturist.henry singleton was born in london, england, into an artistic family. he was not yet two years old when his father died, so he was raised by his uncle william singleton (d. 1793), who had studied under the tutelage of ozias humphry and painted portraits and miniatures. another uncle, joseph singleton, exhibited at the royal academy between 1773 and 1788. henry’s sisters maria and s…