Paintings in Museums and Public Art Galleries:
 Neue Pinakothek, Munich, Germany
10 landscapes online
Museum der Bildenden Künste, Leipzig (in German) 
Schleswig-Holstein Museums, Germany
Staatsgalerie Stuttgart (in German)
Professional Tools:
Artprice
Pictures from Image Archives:
Carl Rottmann in the Art Renewal Center
Carl Rottmann in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German)
Ciudad de la Pintura (in Spanish)
Farbdia Archiv (Color Slide Archive) (in German)
Thousands of photographs of fresco cycles and wall decorations in churches and other buildings in and around Germany.
Click "Galerie" for a normal overview; click "digilib" to zoom in.
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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