The picture of Ursula sinks along with her, a little far behind.
It is highly possible that Undertow is based on the extinct giant shark Carcharodon megalodon.
They both get an idea.
While this is going on, she also plots to take Triton's domain.
And because of lack of stuffing and the way it is sewn, the doll is in a permanent sitting position.
Ariel and have followed Cloak and Dagger to her lair.