Well, it might have illustrations of heroes or villains, speech bubbles with their words, or even some special effects to make the scene more exciting. Sometimes, there could also be little hints or clues for the next page or part of the story.
A page from a comic book can show a lot. It could have a single big panel with a key moment, or multiple smaller panels to progress the story. There might be colorful art, expressions on characters' faces, and maybe even some hidden Easter eggs for keen-eyed readers to discover.
There could be various things like characters, dialogues, action scenes, or maybe some background details.