Before you try this on a whole book, start small. Pick a POV character, and write one scene. Show the character noticing, seeing, and interpreting what’s around him or her. Once you complete that, write the exact same scene but through another character’s POV. Show how they experience the scene differently. If you want a real challenge, make a character notice, see, and interpret something in a way that isn’t universally true, yet make it true for that character. Try to show as much of the character’s personality as possible in your descriptions. Good luck!