Walker used to conceptualize scenes and hire models to depict it. She would take photographs and use it as a source in constructing oil paintings. In 2016, she began exploring the streets of London to find anonymous subjects in natural settings. Walker captures intimate moments of women’s lives. She is known for realistic paintings of women at work. She highlights overlooked jobs — such as in nail bars, salons, hotels, the household etc. — which are performed by women. There is a variety of socio-economic status among her subjects. Walker’s works emit a voyeuristic approach to the viewers, as seen from a vantage point through windows, bannisters or from a certain height. It is further emphasized by how her works are often large, making it easy to envision oneself stepping into the scene. Walker's art often exhibits painterly. Color is an important element for her so as to evoke a painting's aura or ambience.