These images seem small when I click on them - did you choose to upload only small file sizes here on Cake, and have larger ones for your own use? I think you would want bigger image sizes than I see here.
I like the 2nd and 3rd image - with just a bit of curves to created a bit more contrast they might really snap. The few damaged areas look like they would be easy to restore too.
Oval framing was common in the late 19th and early 20th century. I have some images in that format as well.