The dictionary defines perspective as, "A particular attitude toward or way of regarding something; a point of view." In other words, it's all about how you look at things.
I took a photo of these awesome Douglas firs at Camp Yeomalt Park near my house. I happened to look up, and saw how the perspective of the trees was different from what I was used to. Although I'd walked past these trees dozens of times, I saw them in a new way. I had a new point of view.
Having a new perspective on an object that you see everyday can help your writing. It helps because you're learning how to really see, not simply walk past an object (or tree) because--ho, hum--it's part of your background.
Try this exercise on perspective. Find an object in your house that you see nearly everyday. Now change your perspective of it. If it's your refrigerator, lie on the floor and look up at it. If it's your baby photo, tip it upside down. If it's your toothbrush, hold it by the wrong end. If it's your kitchen clock on the wall, pull up a chair next to it (with an adult's permission) and look at it from an inch away.
What new things can you notice about everyday objects? That's the fresh perspective, or point of view, we want to bring to our writing.
Have fun looking at objects. And don't forget to look up at the trees.