Wilma and Pebbles Flintstones drawing

I bought this drawing from an eBay seller who deals in large quantities of animation and comics items. I heard they buy up estates and collections so I realize descripstions might be inaccurate. The drawing is an attractive image of mother and child. There are marginal notes which seem authentic. The asking price was reasonable. UPDATE. I pulled the DVD off my shelf to watch the episode and found Wilma is still pregnant in this episode. So the seller description is inaccurate, but I accepted that possibility when I bought it.