If anyone has information about the artist who drew these images, please let me know. They come from a 1590 edition of Aesop which you can read online at the International Children's Digital Library and also at the Internet Archive. Click here for more illustration slideshows. This book is especially interesting because it contains illustrations for a number of fables by Abstermius and Faernus, stories for which I do not have illustrations from any other source.
Here is the 1590 slideshow (apologies to iPad users - the Flickr.com slideshows are Flash-based, but you can view the Flickr album directly if the slideshow does not work):