He was particularly known for:
* Detailed and realistic depiction of nature: His paintings often showcase the rugged beauty of the American West, particularly the Sierra Nevada mountains.
* Dramatic use of light and shadow: Hill was adept at capturing the changing light of the day and the play of shadows in his landscapes.
* Rich and vibrant colors: He used a wide range of colors to bring his landscapes to life.
He was also known to use watercolor and pastel for his sketches and studies.
So, while oil on canvas was his primary medium, he wasn't afraid to experiment with other materials to capture the essence of the natural world.