Nuckelavee - the demon horse

I made this as a competition entry to design a boss based on Norse mythology - Scottish folklore, for Vaati Vidya's Elden Ring challenge. -

They say this creature is purely evil. Despite it came out of the sea, it fears water, and fire angers it. It is a creatue with two heads, one is a horse's, and one is a human's. It emits a toxic breath, leaving no living behind.
Those who survived seeing it, says it has no skin, revealing its muscles and bones. It has an enlarged head, and arms so long, they can almost touch the ground from horseback. The horse has a giant red eye.

Since this creature is half-human, I wanted to give it as much human-likeness as possible, and would give it a background as something that was human once before. Because of that, I tried to add some sort of hair or clothe on it, and ended up making a ghost-like, torn up, floating white cape with blood stains on it to his back. Maybe it's not so visible, but I also tried to make some sort of jewelry onto it where it