1. An image processing device for performing image processing on a facial image including a mouth of a person, the image processing device comprising a first organ likelihood identification unit configured to identify, based on a difference between a color of a location and a first representative color which is a representative color of an organ to be processed, a likelihood of the location being the organ as a first organ likelihood for each location of a first region including at least a part of the mouth of the facial image; a first weight determination unit configured to determine a first weight so that the first weight becomes smaller the greater a distance from a first location of the first region for each location of the first region; a correction degree determination unit configured to determine a correction degree of the location so that the correction degree becomes greater the greater the first organ likelihood and the first weight; and an image correction unit configured to correct an image using the correction degree.