Looking at them side by side though, I'd say one thing that's certain about the VM composition's animal part is that it is an aquatic creature; there are various fins along the body and the tail-end is fish-like as well. The biscione is terrestrial, according to the Wiki it even means grass-snake, though I don't know if this was still understood.
I agree that it is much more like a person inside the mouth of an animal (as opposed to a mermaid-like creature) but the animal is an aquatic one.
I agree that it is much more like a person inside the mouth of an animal (as opposed to a mermaid-like creature) but the animal is an aquatic one.