I would have loved it if Roonhee had used the idea of the snakes wrapped around each other, where instead the two girls were laying arm in arm with their legs tangled together.
You're asking for it's identity when over half of it is gone. It's a small shark, using the dingo for scale. Using this to try and suss it out, it may be a blacktip reef shark. That being said, it's tail is gone, it's pectoral fins are gone, who knows how long it's been dead and how degraded its colors are...
You'd possibly have better luck contacting someone who studies sharks for a living, though I'm not sure this picture shows enough for them to identify it.