PAINTING LIBRARIES - the best links for your research with 'thumbnails' before the larger scans..
The best web Gallery of Art with over 8000 excellent reproductions of Renassiance painting
Mark Hardens Artchive Alphabetical (no thumbnails)listing of artists with great coverage of pre-twentieth century art as well as all well all others.
CGFA Extensive and cross-indexed site great for the famous and some more obscure names.
Web Museum Not as extensive as the other two but has thumbnails which can save time.

PURE RESEARCH
From Okanlagan University College This site offers an invaluable dictionary or art terms particularly useful to the fine art student.
Copyright information site regarding media and art isssues.
Information on paints and brushes etc.from Dowler-Rowney
Research assistant to Damien Bartoli, the world scholar on William Bouguereau and author of the forthcoming William Bouguereau catalog raisonne. Mr. Sandstead is also archivist for the William Bouguereau Archives in Port Reading, NJ.
The European Fine Art Fair in Maastricht ... an exceptional website for display.

VARIOUS GALLERIES - for research and enjoyment
The Renassaince Cafe - Iian Neil
Iian has assembled the best quality reproductions for the Academy artists of the 1800's I have seen. It is well worth a visit and bookmarking as Ian continues to update the images.
Metropolitan Museum of Art home page.
The online Van Gogh Museum
Home of the Tate in the UK
The Pre-Raphaelite Collection
Has a wide range of quality reproductions.
Learning about leonardoInteractive, interdiciplinary arts driven site well worth a visit.