One thing to consider is to offer to donate the image to the Dayton Art Institute (or another museum like the National Museum of Women in the Arts here in DC) in exchange for a copy of the restored version. My family has been approached by the National Portrait Gallery about some paintings we have, and they have offered to have copies made for us in exchange for the originals, along with a receipt for the value of the donation for tax purposes. You might actually approach the NPG, as they often run exhibits of photography and might very well want to collect a piece like that. If not, I'm sure they would be able to refer you to a qualified restorer.