These are nice - and honestly, if anyone is wanting to learn to draw, a good resource for it. I learned to draw animals and people in a similar manner - this is really good for training the eyes to notice where the mass in a subject is.
My favourite one:<p><a href="https://www.flickr.com/photos/taffeta/3523832414/sizes/l" rel="nofollow">https://www.flickr.com/photos/taffeta/3523832414/sizes/l</a>
This is fun. My first [awful] attempt...<p><a href="http://www.jaruzel.com/files/Jar-Cat.png" rel="nofollow">http://www.jaruzel.com/files/Jar-Cat.png</a><p>(Everything I draw comes out on a slant, dunno why...)
Les Animaux tels qu'ils sont" (1930) is an art instruction book, teaching children how to draw various animals. Blog post contains various scans of the original.