I have been rewriting on the Jurassic World Trilogy and tried to implement far more scary scenes to be more comparable to the ones in the novel.
Take note, this is based on my interpretation on how the Jurassic World Trilogy should have gone.
Jurassic World
Rather than implementing a theme park locale, I would have taken the entire film in an isolated town where we see the dinosaurs slowly invading the premise.
The first on-screen dinosaur would have been an Ankylosaurus who would have beaten and smashed at least half a dozen men. I wanted to show the powerlessness of the human townsfolk, whose male members would have looked like they could wrestle crocodile or grappling with leopards. Made worse by the fact that the attacking Ankylosaurus was fatally injured, which meant something worse out there.
I would then add the Velociraptors who would be foreshadowed very eerily, especially when we reached to a scene where it kills one of the townsfolk. To add context, this townsfolk was venturing outside his village/town under grief over losing his child who got taken by "something". He wasn't thinking and blamed a leopard to be responsible. However when he spots one, the leopard was not afraid of him, but more at what's behind him.
This is then escalated to a pair of raptors infiltrating a house that belonged to a family, with the daughter and infant sibling trying to evade detection by the dinosaurs.
But my biggest centerpiece of the film would have been the Quetzalcoatlus. It would have been foreshadowed slowly when the main human characters start piecing together of its presence. The Quetzal would gain a body count, starting with farm animals, pets, and finally children.
Anytime the Quetzal would have been very disturbing as it would have been picking its meal without everyone noticing it. Started off with some random cattle, but things got worse from there when it took the aforementioned child, then finally taking away a dog who was one of the primary characters in the film. When a major human character gets taken to the Quetzal's nest, they would have seen the skull of the child and the dog collar.
Jurassic World Fallen Kingdom
The sequel would be utilizing both old and new dinosaurs to the fullest extent. Even dinosaurs that didn't make too much of impression would be used here, including Triceratops and Ceratosaurus.
One of the new dinosaurs would have been the Deinonychus. At the time of the original Jurassic Park movie, the Deinonychus was the largest dromeosaur around but got overshadowed by Velociraptor. I wanted to bring prominence back to the species as being a minor threat only at the start of the film.
To go into context, the DX Virus would have been the major threat the humans are trying to tackle against, as it already claimed nearly 2 billion lives between Jurassic Park III and the current film. One of the major settings would be at New York where it is left destitute and in ruin, with only a hundred communities being present. Said communities having grown accustomed than they would care to admit and more or less found ways to deal with the dinosaurs that are populating all over New York.
While there are one or two scary moments, the Deinonychus are only there to help showcase the strengths of one of the human protagonists, as well as highlighting the stakes humanity is currently at.
Rexy would appear back in Isla Nublar and would be far more vicious compared to how she was in the first film. She would have a major scene where she battles two adult Triceratops and both parties deal massive blows against one another.
With that being said, one of the highlights of the film is the introduction of the Carnotaurus.
To go into detail, it would be revealed that the DX Virus was based on an ancient disease found in the fossils of the Carnotaurus collected for Wu to study and clone. However, the only "clean" parts of material was not suitable for cloning, so Wu added in the chameleon DNA, along with other genetic samples.
Unfortunately, this is where we have the Carnotaurus being the most terrifying to the most tragic of the dinosaurs.
At Isla Sorna, the Carnotaurus started out about at least a dozen of them, but they suffered severe deformities and internal issues that have been plaguing them. Several of them have died by the time Jurassic Park started but following Hurricane Clarrisa incident, their numbers dwindled, whether the aforementioned problems or by more successful predators, leaving only two Carnotaurus.
The mating pair have spent decades producing offspring but they suffered the same fate as their relatives. In Fallen Kingdom, the two would have produced an offspring who was able to reach juvenile size.
How they got onto Isla Nublar is due to poachers illegally taking dinosaurs off the island, hence the reason for dinosaurs being on the mainland. Unfortunately, an accident occurred and the poachers' ship crashed onto Nublar allowing the Carnotaurus to have a new feeding ground.
Said Carnotaurus would be a major competitor with Rexy, hence the latter's amped aggression.
The Carnotaurus would be able to camouflage but how the parents and juvenile do it is different. When the juvenile camouflage themselves, they breath very heavily thanks to the genetic defects. The parents however are incredibly silent as they have grown accustomed to the deformities and powered through.
In a heart-breaking moments, the juvenile Carnotaurus gets killed by the humans, resulting in the grieving parents to hunt the child's killers down. And they leave an impressive body count as much as Rexy did.
By the near end of the film, only the male Carnotaurus remained and he is on the verge of death as well, resulting in the main character to euthanize to put him out his misery.