A huge virtual gallery. Picture in high quality.
http://www.googleartproject.com

My favourite virtual gallery
http://www.wikipaintings.com

А portal about art in English and Russian. Art Prices, Picturies Value, Art Values..
www.artinvestment.ru

Encyclopedia of the Russian painting
http://www.artcyclopedia.ru/

The artists from Upper Maslovka
http://www.maslovka.org

AMERICAN GALLERY
http://americangallery.wordpress.com/

A virtual gallery in Spanish
http://pintura.aut.org

The archive `s Virtual gallery
http://www.artchive.com/web_gallery/

Collections of paintings, graphics and sculptures
http://www.art-catalog.ru/

Collections of paintings, sculptures, photoes
http://visipix.com

Encyclopedia of the Russian painting
http://www.artsait.ru/

The Athenaeum.
http://www.the-athenaeum.org/art/popular.php

Australian Art
http://nga.gov.au/Collections/

Russian art :auction
http://korners.kiev.ua/russian/auction

TERRA INCTOGNITA-
http ://territa.ru/

An artist`s forum in Russian
http://arifis.ru/

British Art Gallery
http://www.redraggallery.co.uk

Russian landscape.Virtual Gallery
http://ruslandscape.ru/

USSR Art
http://sovietart.net/main.htm

Masters of the American West Fine Art Exhibition and Sale
http://theautry.org/masters/2010/

Nude
http://artnud.com/main.htm

Russian genre painting
http://rusgenre.ru/

Italian artists
http://www.artitaly.ru/

А portal about art in Russian
http://www.artandyou.ru

Art death
http://artdeath.ru/main.html

Art Prices, Picturies Value, Art Values...
http://www.askart.com

Pictures from old books
http://www.fromoldbooks.org/

Gallery REHS
http://www.rehs.com/virtex.htm

Postcards
http://www.cardcow.com/c/69395/art-art-nouveau