I've been looking for material I can use for reference, I borrowed a couple of books from the library and scanned through them, choosing images I thought would be useful for future work.
The books these images are from are:
MAN AND THE RENAISSANCE
THE LIFE OR MICHEL-ANGELO - Ascanio Candivi
A SHORTER HISTORY OF GREEK ART - Martin Robertson
The images I have are on this page.
Reference Material