It was an impressive ink brush painting because it had a lot of details and the marking on it are high because it is an old painting
The answer is flickering streetlights or light through a window. Film noir is based on mood of pessimism, fatalism, and menace. It is also originally applied on American thriller films and detective films. So, flickering street lights or light through a window explains that the best.
Because it.. Placed her away from the center of the composition.