Does anybody know anything about the painting that is over the bed in Samantha and Darrin's bedroom in later Dick York era seasons (season 4-5) of Bewitched?

There's a whole article about the art of Bewitched: https://www.harpiesbizarre.com/art.htm

No idea

I liked the angel blowing a horn that hung in the upstairs hallway. It was not a portrait though. It seems like it was there for most all the seasons.