Variations of the finale appear based on your overall item collection percentage (time taken to beat the game doesn't count). See below for the added ending scenes and their requirement.
|Complete the game with less than 75% items collected:
Samus watches from atop her gunship as the Artifact Temple burns, contemplating her future before leaving the planet.
|Complete the game with between 75% - 99% items collected:
As Samus watches the Artifact Temple burn she'll remove her helmet. We then see a close-up of her face before she departs the planet.
|Complete the game with 100% items collected:
Keep watching after the credits roll for a hint of Metroid Prime's fate.