Tonality is the interplay of light, contrast and color, of the various elements in an image. Producing the perfect tonality is determined by the photographer’s vision.
One of the more sophisticated montage techniques available to Photoshop users enables selective blending of pixels based on their tonal or colour value.
In the olden days, there weren't any really great ways to create hair and fur effects. But Photoshop 7 will allow you to design your hair strand by strand and generate a highly complex effect with little effort.