Always scan pictures at at least 300 dpi resolution. For pictures you are particularly interested in restoring enlarge them at least double their original size. Be prepared for a huge file, but one you can blow up and work on pixel by pixel. Even with that, in this picture of my mother and older sisters I had trouble getting a clear picture of my mother out of the picture. In making the image smoother, I lost clarity. In clarifying it the picture lost a more 'finished' look. Her hair on the right side blended into the background and I couldn't get it just right in the cropped image.