I am not completely sure that this miniature portrait is by Pamelia E Hill (1803-1860), but it does have similarities with examples of her work in the Worcester Art Museum, especially the portrait of Sarah Loring House Turner. There are similar piercing dark eyes and background shading.
The image shows how artists went over the edge of the ivory, particularly with the preliminary background. One can often see how the colors were mixed to achieve subtle tones.
Relatively little is known about Pamelia Hill who was overshadowed in the Boston area by the Goodridge sisters, Sarah and Eliza. 1378