Artist Jennifer Dickson was known for her haunting photos of gardens and palaces

When Jennifer Dickson was an emerging artist in London in the 1960s, a journalist attended her first major show and pronounced: She was one of the “prettiest girls” in modern art.This sexist condescension marked Ms. Dickson, who often identified it as the day she became a feminist. She went on to build a lifelong career as a successful visual artist and was known not only for her haunting photographs of gardens and palaces but also as a vocal advocate for female artists, for artists’ rights and for a municipal gallery in Ottawa, the city she eventually called home.