This painting, one of two views of Mortlake Terrace painted by Turner, is a view from the house, looking directly west into the luminous glow of the setting sun. Turner established the quiet mood of the late-afternoon scene with two ivy-covered elm trees, whose soft, feathery leaves and curving limbs frame the painting. Long shadows create elegant patterns on the lawn that almost obscure the human element in the scene. Scattered about are a gardener's ladder, a hoop, a doll on a red chair, and an open portfolio of pictures that have been just left behind by figures watching the Lord Mayor's ceremonial barge.
The painting was done about eight years after Turner's first stay in Venice, where his perception of nature and the physical world was profoundly changed by the city's unique light and atmosphere. Light immobilizes the river and gives its surface a dreamlike shimmer. The stable mass of the classical gazebo, the delicate linear clarity of its architectural details, and the carefully depicted windows in the buildings on the left bank of the river coexist in Turner's vision with the heavy impasto of the sun's forceful rays that spill over the top of the embankment wall and dissolve the stone's very substance.
More information on this painting can be found in the Gallery publication British Paintings of the Sixteenth through Nineteenth Centuries, which is available as a free PDF https://www.nga.gov/content/dam/ngaweb/research/publications/pdfs/british-paintings-16th-19th-centuries.pdf