A pair of lambs visit small child sitting in a field. This black and white line drawing would make a great coloring book page. If you don’t need the sheep, they could easily be cropped out of the scene.
This is another charming vintage image from the unattributed book Our Pets which dates back to around 1880.
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.