Fan Casting The Little Mermaid: live action

Ariel is a mermaid that wants to be a human. She saves prince Eric and falls in love with him, but her dad finds out and doesn’t want her to go to the surface. She makes a deal with a sea witch named Ursula and gets legs. Ursula casts a spell onto the prince and they almost get married but then Ariel crashes the wedding and the prince re-falls in love with her. Then they get married. There is also a little crab named Sebastian in this.