I've seen the one with the barn behind him before but not sure where. Either one of my sims have painted it in the past or I've seen it when I've been in sims store. Because it reminds of Farmville on Facebook with the red barn and that famous painting (which I don't know the name or who painted it) where there's a farmer and his wife and he's holding a gardening fork with a barn behind them. Do you think that's where they got the idea from?
The painting you referenced is called "American Gothic" but I forget the artist. If you really look at the paintings closely, (and maybe have taken a History of Art course?), you should recognize, even subliminally, several famous painters/artists. Andy Warhol, Van Gogh, Monet, Manet, DaVinci, Reynolds, and Picasso to name a few. They aren't exact copies of course, but close enough to be recognizable.