This is a very cool image. Would you ever be willing to allow its use in a non-profit documentary? If you are interested I will be happy to explain in more detail.. Many thanks and appreciation for sharing!

I'd actually put this closer to 1860, given the hair and bonnet styles.

Interestingly you can sort-of guess what's going on here from what the tinter has picked out with color. The fact that their wedding bands are picked out in yellow means that their wedded state is important. The fact that they're also wearing light-colored bonnets and the tinter has also touched up the flowers on them means that this is very likely a bridal portrait from a double wedding. Given the facial resemblance between the two ladies, and the fact that they're holding hands, I'd bet they're sisters. And given the style of the clothes, if this is American, it might have been one of those "wed your sweetheart before he heads off to war" sort of situations.