1. A computer-implemented method for processing an image of virtual fitting model using a computing device, the method comprising: determining, with a processing device included in the computing device, an average value of skin tones of a human body in a pre-selected region of a reference image; calculating, with the processing device, a ratio which is obtained from dividing the average value of skin tones of the human body by an average value of skin tones of an image of a virtual fitting model; multiplying, with the processing device, each one of pixel values of a body region in the image of the virtual fitting model by said ratio; and setting, with the processing device, the pixel values of the body region in the image of the virtual fitting model to the results of the multiplication to create a modified version of the image of the virtual fitting model.