Vintage drawing of the letter D surrounded by vines and flowers. This letter D image is more like a hand-drawn doodle than the typical wood-cut-like engraved fancy letters typically used in books during the 1800s. It’s in the public domain which means you can use it freely.
I found several similar fancy letters images, drawn by Gordon Browne (1858-1932) in National Rhymes of the Nursery.
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.