1. A portable electronic device, comprising: an image capturing device operable to capture a person image of a user; a storage system operable to store one or more special images and face character data; a display screen, and at least one microprocessor; and one or more programs stored in the storage system and executable by the at least one microprocessor, the one or more programs comprising: an image analysis module operable to obtain the person image from the image capturing device, and analyze the person image to determine a face area of the person image according to the face character data stored in the storage system; an image adjustment module operable to mark the face area with a rectangle area and calculate a size of the rectangle area, obtain a special image from the storage system, and adjust a size of the special image according to the size of the rectangle area; and an image replacement module operable to replace the face area of the person image with the special image to generate a face replacement image, and display the face replacement image on the display screen.