Lost and found: Constable's portraits

This painting of the artist's father Golding Constable, c1805, was originally thought to show his schoolmaster Thomas Grimwood. Photograph: Colchester and Ipswich Museum Service

Anne and Mary Constable, two of the artist's sisters, painted in 1814. Photograph: Trustees of the Portsmouth Estates

This portrait shows Maria, by then Constable's wife, with two of their children, c1820. Photograph: Tate

The artist painted over 100 portraits during his working life. Mrs Edwards, c1818. Photograph: Erik Gould/Museum of Art, Rhode Island School of Design

Over 50 of his portraits and sketches are gathered in Constable Portraits, including Mary Freer, 1809. Photograph: Private collection

Constable painted this portrait of his fiancee Maria Bicknell in 1816. Photograph: Tate

Dr Herbert Evans, painted by Constable in 1829, was the artist's family doctor. Photograph: Private Collection

Constable painted his 14-year-old son Charles Golding Constable in 1835-6, when he was on the point of going to sea as a midshipman. Photograph: The Britten-Pears Foundation

Ann Constable, c1805. This recently discovered portrait of Constable's mother is now on display at the Wolsey Art Gallery in Christchurch Mansion, Ipswich. Photograph: Colchester and Ipswich Museum Service

Constable painted his favourite and youngest sister Mary as A Girl in a Red Cloak (Mary Constable), 1809. Photograph: Private Collection

John Constable is widely recognised as a landcape painter but his portraits are often overlooked. Self-portrait, 1806. Photograph: Tate

The works on show in Constable Portraits range from finished oils to sketches. Soldier playing Guitar, c1806. Photograph: Trustees of the British Museum