Paintings in Museums and Public Art Galleries:
Charles Muller in the Louvre Museum Database, Paris (only available in French)
Réunion des Musées Nationaux, France (in French)  (Click the magnifying-glass icon to zoom, then drag the corner of the window to make it larger) 4 works online
Bowes Museum, County Durham, UK The Wounded Soldier
Flemish Art Collection Database (in Dutch) 
The Wallace Collection, London, UK An Odalisque, ca.1850s
Smithsonian Institution Art Inventories List of works nationwide from two sources: the Inventory of American Paintings Executed before 1914 and the Inventory of American Sculpture (only a few percent of listings have an accompanying image)
Professional Tools:
Artprice
Pictures from Image Archives:
Charles Muller in the Art Renewal Center
Charles Muller at Insecula
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
La Tribune de l'Art (in French)  L'Aurore
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