The painting with the old man praying is "Grace" by Eric Enstrom. Rather than a traditional oil painting, it is actually a black and white photograph that was colorized by hand by Enstrom's daughter, Rhoda Nyberg, according to GraceByEnstrom.
"Grace" shows an old man – identified by Enstrom's family on GraceByEnstrom as Charles Widen, "a bearded, saintly old man, with foot-scrapers to sell" – who happened to call on Enstrom at his studio in Bovey, Minn. in 1918. Enstrom set out some props on a table, including a loaf of bread, a bowl of gruel and a pair of spectacles, and asked Widen to pose as if he were praying before eating the meager meal. The resulting image has been reproduced countless times and is displayed in churches, mission stations and homes. "Grace" has also been named the official state photograph for Minnesota.