1stdibs - painting websites

At 1stdibs  here to connect the world's best dealers, finest shops and most important galleries with individuals, the world's most sophisticated collectors, designers and curators.

https://www.1stdibs.com/

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Web Gallery of Art - painting websites

The Web Gallery of Art is a virtual museum and searchable database of European fine arts from 11th to 19th centuries.

http://www.wga.hu/