Thomas Buttersworth (1768 - 1842) - was an English seaman who served during the Napoleonic wars. Later he became a marine painter and produced works to commission. Several of his pictures use the Rock of Gibraltar as background interest. One would imagine that he must have visited the Rock more than once during his service in the Navy.
His son, James E. Buttersworth (1817 - 1894) also became a marine painter. James eventually moved to the USA in 1845 and is best known for his portraits of American ships. Like his father he used Gibraltar as a backdrop but my feeling is that he never actually visited the place. His impressions of it look remarkably similar to those of that appear in his father's paintings.
Paintings by Thomas Buttersworth
Off Gibraltar
A Stiff Breeze off Gibraltar
The Argo and a Russian Ship off Gibraltar
Title unknown
A Royal Naval Cutter Heading into Gibraltar
Gibraltar Point - English Cutter and Spanish Cutter Engaging
Paintings by James E. Buttersworth
A Schooner and a Barque Sailing into a Harbour
American Frigate off Gibraltar Flying the Commodore's Pennant
Frigate off Gibraltar
Frigate off Gibraltar
A Major Thunderstorm hits Gibraltar
Unknown Title
New York Yacht Club Schooner