CGFA
Carol Gerten Fine Arts: Duccio Di Buoninsegna
This presentation provides a list of Duccio di Buoninsegna's work (complete with pictures), as well as a brief biography.
Smart History
Smarthistory: Standard Scenes From the Life of Christ in Art
Features artistic images with descriptions of the life of Christ.
CGFA
Carol Gerten Fine Arts: Jan Van Eyck
This online gallery contains copies of many van Eyck paintings. Also includes a link to view his biography. A good source for reports and papers.
Web Gallery of Art
Web Gallery of Art: Leonardo Da Vinci
A superb online collection of Leonardo's art. View many of his masterworks at this site, along with drawings, paintings, and inventions. Each reproduction includes a short commentary. A detailed biography is included, with embedded links...