The skin: The Skin should be coloured in muted shades of black, blue or bronze like the original Alien design because they did not get human skin colour or animal fur.
The body: The body should remain tall, slim and boney like the other Aliens. Not thick, meaty and muscular.
The dreadlocks: Alien doesn't get hair from human or animal hosts so there's no need for them.
The Vocals: The Alien did not get any vocal sounds from the humans, the dog or the ox in Alien 3 Extended.
Reproduction: If the Predalien is a queen why change the reproduction process, it makes no sense. The Strause brothers said something about we don't know how Predator have sex. I thought the Predators have sex the same way as we do. What about when the queen comes from a human host, that didn't change her reproducing process. It was also said in Alien Resurrection that the queen take few days to reproduce, not a day.
Mandibles: I question this one a lot because the Alien that came from the ox didn't have horns so I don't think the alien follows the bone structure of its host.
No Predator behaviour: The alien didn't play with a dog toy in Alien 3 so why would the Predalien rip the spine (or skin its victims)?
I think 20th Fox should have hired H. R. Giger and Stan Winston to make the Predalien.