Is it required to cite a specific work of art in a bibliography?

I wrote a large paper on an 18th century artist and used quotes from many books which I cited properly in the Chicago style format. I also referred to specific pieces of the artist's work, and put the names of the work in italics. I included a bibliography at the end of the paper, but only included the books from which I used quotes and paraphrased. I didn't include citations to each piece of art in the bibliography. I figured if I was writing about Michelangelo's David. I would simply write about the piece using David in italics and not have to put in the bibliography where I saw the work, the size, museum, etc. It seems like overkill. I've already turned in the paper, but wonder if I may have messed up or am I over-thinking it?