1. An image-processing device for performing processing of coloring a skin of a face image of a person with a pattern in a certain color, comprising: a color-correction unit that corrects the color of the pattern to determine a color for a first region in the face image of the person and a color for a second region in the face image of the person such that the colors of the pattern applied to the first region and the second region vary in the first region and the second region, where the face image of the person is colored with the pattern; and a coloring unit that colors the face image of the person with the pattern by superimposing the pattern on the colors in the first region and in the second region, wherein, using a difference between a representative color of the first region and a representative color of the second region, the color-correction unit corrects the color of the pattern to determine the color for the first region and the color for the second region such that if there is a difference in the representative color of the second region as compared to the representative color of the first region, the pattern at the second region is applied with a lighter color degree as the difference increases.