This painting represents an experiment gone awry. Charles Churchill is by British artist Joshua Reynolds, dating to 1755. The ghostly pallor we see on the subject results from experimental techniques by the artist that didn't go according to plan.
River Landscape With Cattle Watering and Ferry Boat is by Thomas Gainsborough, circa 1754-56.
Gainsborough also painted this 1780 portrait, The Reverend William Stevens.