Texture Painting - Blender Master Class: A Hands-on Guide to Modeling, Sculpting, Materials, and Rendering - page 163

Figure 11-12: Cloning in texture from photographs with the Clone tool. I added the photograph as a new layer; then, on yet
another new layer (set to Overlay), I cloned from the photo to create some skin detail for my texture.

Figure 11-13: Some close-ups of hand-painted details Figure 11-14: The nails and teeth