Rev. William Hamilton Watkins, DD, born 11 April 1815.
Because of WikiTree, I now know what my great-great-grandfather looked like! The following picture was provided by a distant cousin who found me through the profile I had posted for him.
Portrait of Reverend Watkins (c1835)
This is an excellent example of a portrait produced by an itinerant artist of the time, who had canvases with the torsos already painted (the artist would add the head & hand et voilà).
Update: I just looked up [my answer] to the 2018 Week 11 Challenge, "Lucky", which was about his portrait! (I didn't do so well in the 52 Ancestors Challenge and still haven't fulfilled my intentions stated in my answer for Week 11 - see my space page, [Liz's 52 Ancestors in 52 Weeks].)