This is "Mr and Mrs William Hallett ('The Morning Walk')" by Thomas Gainsborough. Painted in 1785, the style draws on the work of earlier painters Watteau and Van Dyck, with a delicate poetic quality largely achieved through Gainsborough’s light, feathery brushwork.
Here you see William and Elizabeth Hallett arm in arm on a morning walk, accompanied by their Pomeranian sheepdog. The couple may be wearing their wedding clothes – Elizabeth's ivory silk gown is caught at the waist with a black silk band, while her husband wears a black silk velvet frock-suit. Gainsborough's use of slanting brushstrokes in the sky and foliage gives the impression of movement.
The portrait has been seen as a universal statement about wedded bliss, but it was also commissioned by William Hallett himself, who paid Gainsborough £126 for it in 1786. The picture is as much a portrait of the romance of young love as it is a likeness of the couple.
Mr and Mrs William Hallett ('The Morning Walk') hangs in The National Gallery on Trafalgar Square, London — free to enter. Point your phone at any artwork there and audioguide.london plays a free audio guide in six languages — no app download needed.