Sometimes a number of factors combine to cause us to double take a pretty picture. This photo in particular looks rather mundane upon first glance. The subject is centered nicely, her hair is arranged, her expression is appropriately moderate. One may not look beyond these traits and be completely satisfied with the image.
Not me, though.
I noticed that the particular hair arrangement this lady chose, along with her chin being tilted slightly downward, makes her head look flat on top. Unfortunate. Probably in person she looked lovely and within the norms of her fashion choices. Combine with this that one of her eyes seems to be slightly droopy, or less opened than the other, and she looks less put together to the discerning eye bent upon picking apart the portrait. She looks, in fact, a bit sleepy.
All that withstanding, this is a nice image, and is the first I can recall with a green border. Typical borders in the 1860s were black, some red. According to various sites, the thin line puts this in the 1862 range, and the size of the image puts it in the 1860-1864 range. The dropped shoulders of the dress that can be seen matches this general dating.
The photographer was J. Beard at 8 Old Bond Street, Bath.