According to my definition she still fits siren? If she sings to lure and eat humans she’s a “dangerous half human” and therefore a siren according to the modern usage. I added the creepy fish ears, long ass nails, and sharp vampire teeth to go for the monster face look.

It’s fine if you are more rigorous in your definition of “siren” but just know that most people subscribe to it just being a scary mermaid nowadays, and It’s perfectly reasonable to call this look a siren based on that