You can find good information and analyses in "Writing on the Body of a Queen", by several authors under the direction of Dena Goodman.
I also recommend Chantal Thomas' "Wicked Queen", which is an analyse of the mythical Marie Antoinette through pamphlets. She was represented as a debauched woman, but always for political reasons.
Pictures are rather hard to find.
Here she is portrayed as a lascivious woman.
Now you can see her as an harpy.