This vintage trumpeting elephant drawing would make a great image to use for an announcement or invitation. It’s downloadable and in the public domain so you can use it however you wish.
The Elephant and the Wishing Fairy included this and several other drawings by Dugald Stewart Walker (1883-1937) which was published in 1921.
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.