Line setter drawing from a book on learning how to draw. Drawing and Painting Book horses dogs and other animals was published around 1900 and featured the drawings of Harrison Weir (1824 – 1906).
It is a drawing designed to teach students to first sketch their piece and add more details as you go along.
I think it would make a great coloring book image. The setter drawing shown here is a little smaller to fit on this page but you can simply click on the picture to see a larger version.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.