This fine Edwardian era photograph features a middle aged woman with a stern face. Her hair is twisted up on top of her head in a style popular in the early 20th century. Her high-necked dress has an embellishment of lace across the bodice and on the collar. Finally, there are six buttons front and center, which are probably non-functioning, meaning her bodice fastens in a different way. It is likely the dress has hooks & eyes, or less attractive workhorse buttons hidden by a placket.
The image is oval shaped in the center of the gray card. The card itself is about 3″ x 2″. I have two other photos that came with this one, and all were found in Tennessee.
UPDATE I forgot that this had been identified on the back as Mrs. S. M.