Born in Dartford, Kent. Despite her family's disapproval, she trained at Regent Street Polytechnic under George CLAUSEN and David Murray, and in Paris where she discovered the work of Monet. The latter greatly influenced her handling of subjects and colour in impressionist fashion. The Artist (journal) made much of her work, considering her to be one of the greatest women painters of her time.
She first visited St Ives in 1920 and took one of the Porthmeor Studios which she retained over many years, despite also having a permanent home in London all of her life. In St Ives she also met her lifelong friend Marcella SMITH. In 1928, when the St Ives Society of Artists was re-organising its efforts and inviting distinguished artists to become honorary members, Dorothea Sharp was one of those invited.
During WWII she moved to St Ives and she and her friend, Marcella SMITH became prominent members of STISA. Titles include Paddling at St Ives (c1930), Sand Castles (B&W Ill, Falmouth Exh Cat), A Sunlit Garden, The Warren, St Ives (c1930) and Flowers in a Window. Her paintings are held in many permanent collections.