 Complete the following phrase:  His subjects included architectural studies, of which he produced a number of popular sets and landscapes. He received various medals and awards for his etchings. It was during this time that he published a number of sets of etchings such as The Clyde Set, The North Holland Set and The North Italian Set. In general his prints feature areas of great darkness, offset by highlights. Cameron would later become known for his church interiors and barren landscapes of Scotland done in drypoint. The feathery lightness of these drypoints was in visual contrast with the rock and water of the subjects. He became highly sought after by collectors, until the 