Janet Fish is known for her large, bold, Realist still life paintings. Among her other favorite subjects are everyday objects, such as clear glassware, either empty or partially filled with liquid.  Other subjects include teacups, flower bouquets, textiles with interesting patterns, goldfish, vegetables, and mirrored surfaces. She occasionally includes the human figure in her still lifes. Her work has been characterized as photorealist, although she does not consider herself as such, and also associated with new realism. Elements such as composition and use of color demonstrate her point of view as a painter rather than a photographer.