The oil on board measures 10 x 15in (25.5 x 38cm) and is available for £28,500.
The show features the usual variety of works by traditional, established and emerging artists.
A selection of British artists includes Robert Kelsey, Maggie Hambling and Ania Hobson (half-Polish, half-English, who won the BP Young Portrait Award last year).
The show runs at the Suffolk gallery until July 7.