As you work, it's a good idea, from time to time, to hold a mirror to your sketch. The image in the mirror frequently shows distortion you might not recognize otherwise. In the book you will notice that the new step additions (in color) are printed darker so they can be clearly identified. But be sure to keep all of your construction steps very lighty. Here's where the kneaded eraser can be useful. You can lighten a pencil stroke that is too dark by pressing on it with the eraser. Excerpted from Birds: The Step-by-Step Way to Draw Chickadees, Peacocks, Toucans, Mallards and Many More of Our Feathered Friends by Lee J. Ames, Tony D'Adamo All rights reserved by the original copyright owners. Excerpts are provided for display purposes only and may not be reproduced, reprinted or distributed without the written permission of the publisher.