In general, the method I worked out was to layout several layers of the dyed wool. Each layer was spread out so that the “grain” of the wool was in a different direction. With enough layers so that the wool was about an inch thick I would then felt the layers together with my multi-needle tool. With the lightly felted square I would then pinch in the major features of the face, tacking each into place by using the single needle to push the wool into the foam work surface. I then used the single needle to felt in the rest of the facial details: pushing in recesses like nostrils and wrinkles; teasing out obtrusions like eyebrows and noses; cutting in holes like eye sockets and mouths.