He wrote back:
I took a some pics of the painting, from my iphone, as some thief stole my digital camera last fall :(. It's not hanging now and needs some plaster fixed on frame (as you can see in pic). As I look at the picture and read my comment from your blog, I don't think she looks as somber now as I once thought before. Ms. Stuart was definitely a master painter. The person in the portrait would be my great-great grandmother (Jane Adams), i believe.
Kind regards, Mark
Jane was the youngest of 12 children born to Gilbert Stuart and his wife, Charlotte and was one of her father’s most trusted studio assistants, often mixing paints for him as a child and later helping to finish his paintings. She maintained her own studio in Boston for several years before moving back to Newport in 1858, and continued to paint and entertain up until her death in 1888.