Paintings in Museums and Public Art Galleries:
National Galleries of Scotland, Edinburgh 3 works online
The Royal Collection, London, UK (Zoomable - look for the magnifying glass and the text "Magnify image")
Art Fund for UK Museums
Fleming Museum at the University of Vermont Elizabeth, Wife of the Earl Of Kildare
Hunterian Museum and Art Gallery, University of Glasgow, Scotland The Virgin and Child, etching, 1647
National Portrait Gallery, London, UK
Tate Gallery, London, UK
Commercial Galleries:
Peter Nahum At The Leicester Galleries, London, UK Archive of past displayed works which are "sold" or "not for sale"
Professional Tools:
Artprice
Pictures from Image Archives:
John Michael Wright in the Art Renewal Center
John Michael Wright at CGFA 
Wikimedia Commons Image Database 
Other Web Sites:
UK Government Art Collection
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
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