You might want to tale your time with this third step because you have to draw each individual shape that makes up the snake like rock body. Start with the face by drawing a few lines that will make the face look strong, and like a rock. Add the eyes, and then the lower jaw. Once that is done, start drawing out the uneven shapes for each piece of the body like so. Notice how the body pieces hold an uneven pattern. For instance, one shape will be big, and the next will be small.