This has to be my favorite turtle image so far. There’s just something so charming about this little turtle hiding in his shell. While not part of the story where I found him, he sports a cross on his shell that may make this vintage drawing particularly useful for a bible study class on the Tortoise and the Hare. In 1921, children all over the world were enjoying The Peacock and the Wishing Fairy and all of the wonderful illustrations it contained from Dugald Stewart Walker (1883-1937).
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.