Doug DuBosque takes on perspective drawing, cars, and animals from a variety of environments. One of his first books, Learn to Draw Now, is available as a free download (Kindle / ePub). His books are in black and white.
Damon J. Reinagle, on the other hand, loves to draw people, and in his books fires up his imagination to engage budding artists with colorful and creative scenes and settings. Three books are in black and white, and two in color.
See color illustrations from Draw Monsters here.