I was featured on the recent podcast, Cords, Vines & Dines. My interview starts around 3:40. Check it out!
Here are examples on how each type of point of view looks to the reader.
Omniscient: The old forest was gloomy and humid. Not even a hint of a breeze stirred the leaves. Occasionally a small shaft of sunlight broke through and illuminated a small patch of ground. Vines hung from the lower limbs of the huge oak trees and thick spider webs filled in the spaces between vines and limbs.
In this case the narrator is the author telling the reader what the forest looks like.
Third person limited: Jack traveled through a gloomy forest. Already sweat soaked his shirt. Ahead, a small ray of sunshine somehow evaded the thick umbrella of oak limbs and shone on a pile of moldy leaves. Jack ducked under a vine hanging from a tree limb and sidestepped a thick spider web.
Here we see the forest narrated by a character who uses actions and feelings to help the description: soaked shirt, ducking, sidestepping. This type of narrator brings the reader closer to the action than in the previous example.
First person: I had a sense of foreboding about the gloomy forest. Even the small shaft of sunlight ahead didn't do anything to lighten my mood. Sweat ran down my nose and dripped on my already soaked shirt. I had to duck under a drooping vine to move ahead and edge around a thick spider web.
This time, the description is even more personal and the reader is brought even closer to the forest. That is the consequence of using a first person narrator.