Actually, her expression is directed towards the painter, Eleyaraja. The look is one of disapproval at him taking a picture of her. Eleyaraja’s creative process is to take photos of village life and translate it to oil paintings. He uses this process to convert disposable yet hidden moments into a tangible and public object. I interpreted the subject as waiting for a loved one based not on her expression, but because of where she is sitting (threshold of her home) and the time (twillight). Your post inspired me to write a longer analysis that I hope to publish soon.