The only places I’ve seen rocks by the water on Hatteras Island is by the jetty and ferry, and on Ocracoke Isand by the the ferry. This oil pastel is a coastal study is of the rocks in those areas, sans the jetty and the ferry.
Using blues and grays and white for the sky and clouds. Several shades of browns for the rocks and several shades of blue for the water. All applied with quick rough strokes.