This low angle shot from The Avengers presents the antagonist of the film, Loki, to be a powerful villain. This would make the audience feel like he is a serious threat to the protagonists. The low angle shot also displays how the character sees himself as more powerful and important than humans, and enjoys the feeling of being powerful, as in the next shot, humans are kneeling below him.
This high angle shot from the film Dune, uses the high angle to present the character as powerless and vulnerable against the Sandworm. This contrasts the low angle shots also used in the scene to display the extreme power of the sandworm.
This birds eye view shot from the film Knives Out emphasizes the emotions of the character Marta, as she had just gone through a lot and now it is all over, so she can relax. The high angle shot is often used for displaying crime scenes, so this shot mirrors a crime scene, especially since she is laying down with a knife. This might suggest what could have been if the knife was not fake.