Thank you all so much for your efforts.
When I scanned the photo several years ago, I thought I was doing good to get that much contrast. The original is worse. I will have to see if I can get hold of it now and do it again at a higher resolution. I didn't know what I was doing then, in terms of resolution. I'm slowly learning. Your taking the time with this is much appreciated.
It was fun to see the three shots my grandfather took -- this one, another of 4 of the girls and their father at the same grape arbor, and then the final one when he told them to 'clean up' and he did a much clearer, sharper job of it. They were all dressed up. Apparently these first ones were sort of 'rehearsals' for the final shot.