I think the horror actor might be Lon Chaney. Worth looking up the official website. I think it's not Douglas Fairbanks Jr, but rather Senior. If you google him, you'll see that photo under Images a few sites down.
A good insight would be looking at the collection at Kew Gardens (not sure if they have illustrations online). Botanical Art is the faithful recording of plants in drawings and paintings (colour, size, etc).
The others were all correct about the human body and the admiration of it. In ancient Greece and Rome it has to be considered that when the gods and goddesses were created, that it how they were made. No body hair, no need for clothing, which is a human social concept. They lived in the...
What about joining those pieces together, cutting out the outline of your grandmother, laying it on the background and making a light outline in paint?
It's a very deep bas-relief carving, much deeper than many old middle-eastern carvings. You might consider asking the Keeper of Middle Eastern Antiquities at the British Museum, who might be able to pinpoint it. I wish you had said where you saw it.