This is (a photo of) a black and white photo, circa 1880-1890, of what is probably a color oil painting dating from that era or earlier--I'd guess earlier due to the clothing--and on the back is written "Aunt Lawrence". I post it online in the hope that it will get indexed and recognized, because maybe someone still has the painting. (I've tried Google's reverse image search.)
The photo is in a collection from George L. Underwood (1831-1920), my 4xG uncle, who was a photographer, and I'm certain it's from his wife's family. His wife was Katherine (Kate, Catherine) Luyster Underwood, 1835-1911?, born Kate Lawrence Luyster. Her paternal grandmother was Catherine W. Lawrence, 1763-1855. CWL's father was William Lawrence, 1729-1794, who was married to Anna Brinckerhoff, 1733-1770, and one of GLU's children, Ethel, gets her middle name from Anna (her 2xG grandmother).
Even with the help of Ancestry.com, I cannot currently determine who "Aunt Lawrence" is exactly.
GLU's line died out in 1977, when the second of GLU's two grandchildren died, although the photos had been in a closer branch of my family due to what appears to be the implosion of GLU's family around 1888-9.
Update: An owner of an antique store was really kind and estimated that the painting is from between 1840 and 1870, based on the woman's clothes. One guess is then Jane Lawrence, 1783-1838, who was Kate Luyster's great-aunt (so her father would have referred to Jane as an aunt), because Jane is the only woman in that generation who lived to adulthood (according to Ancestry.com records) who wasn't Kate's grandmother (Catherine W. Lawrence, married to become Catherine Luyster, 1763-1855). Jane appears to have married a Hendrick Suydam, so wouldn't be a Lawrence after that. The records aren't always great from back then, though. Or, perhaps family members referred to Kate's grandmother as "Aunt Lawrence" and maybe that's why Kate had a photo of the painting. The date estimate is a bit better for her as it is.