What's wrong with this image that a kid couldn't be exposed to it?
They would have all kinds of questions, and you could answer them. "This is what we look like on the inside. This is where poop is made." "Yes, they are naked" "They are eating apples" "The picture is about a story that some people tell about how the first people were created." "That's a snake at the top, but he's not the kind that bites you. He talks in the story."
"They don't quite look like us because people have evolved over time. They look more like cavemen. Yes, like Fred and Wilma!"
You answer the questions, and surprisingly the kids are satisfied, no harm done, and your art goes up on your wall.