Original Oil Painting Native American Indian Smoking a ??????

This is a very unique oil painting of what looks like an old woman (native american?) smoking a joint. The paint looks aged because of the crackling it has. There is a small scratch to the paint above the womans head (see picture). I took this to Appraisal Day at the local library and the appraiser loved it, but couldn't tell me anything about it. He did mention the great detail on the hands and face. He also said that the face looked familiar, as though he had seen other painting with the same woman. I am trying to find out if anyone can tell who signed this(listed artist?). It looks like TS, but that is all I can make out. I am wondering what the value would be and the age. Any info would be appreciated. Thanks!