Most portraits are painted at about the size of the people they portray, or much smaller. Kings and queens were often painted bigger to be impressive.
Shani Rhys James paints self-portraits slightly larger than reality. She examines herself in detail. She does not make her self-portraits flattering but often shows herself wearing old overalls in a messy studio.
Studio; Self-Portrait (1993) shows her standing, so it is a big painting: 178 cm high. Her figure fills the height of the canvas, which is about 25 cm taller than the artist in reality. To look at the painting at its real size you might need to enlarge details or project it on the wall. The artist’s head should be about 28 cm high.