Paintings in Museums and Public Art Galleries:
 The Royal Collection, London, UK
(Zoomable - look for the magnifying glass and the text "Magnify image")
Minneapolis Institute of Arts, Minnesota 
Madonna and Child, 1855
National Art Databases and Museum Inventories:
Joconde Database of French Museum Collections (in French) 
Pictures from Image Archives:
Franz Ittenbach in the Art Renewal Center
Franz Ittenbach at The Athenaeum 
Wikimedia Commons Image Database
Bildindex der Kunst und Architektur (in German)
(a welcome screen is displayed for a couple of seconds before the search results appear)
Articles and Reference Sites:
Union List of Artist Names (Getty Museum) 
Reference sheet with basic information about the artist and pointers to other references.
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