"a capriccio of Venice in a gilt rococo frame"
A capriccio is a painting in which architectural features, such as buildings and archaeological remains, are depicted in a bizarre and fantastical way. It may also include human and animal figures, but these are generally secondary to the architectural subject.
Capriccio with Venetian themes (2nd half of 18th century) - Credit: Francesco Guardi
The elaborate and ornamental artistic style known as Rococo, or Late Baroque, developed in early 18th century France. It is seen as more playful and graceful than the earlier Baroque style.