Really? I thought it was one of the best books on Elisabeth alongside Elisabeth. Bilder Ihres Lebens by Johannes Thiele, Elisabeth - Bilder einer Kaiserin. Portraits of an Empress by Brigitte Hamann, and Elisabeth: Prinzessin in Bayern, Kaiserin von Österreich, Königin von Ungarn by Gerda Mraz & Ulla Fischer-Westhauser ...
Bilder einer Kaiserin is a bit disappointing. I have a 1992 Hungarian edition, but I don't think that many things have changed in the new ones. Incorrent dates and attributions, sometimes the quality of the reproductions is poor, too.
Ulla Fischer-Westhauser's book - which corrected many of Hamann's mistakes - is REALLY great, it's sad that the book is based only on the (otherwise stunning) collection of the Österreichische Nationalbibliothek. It would be great to expand the research area and include for example the Hungarian montages, paintings, retouched photographs, etchings based on the same originals. There are many...
As a Hungarian art historian I'm working on something similar, I already have some publications about this topic, and I hope that in a few years these researches will lead to a book like Fischer-Westhauser's. Fingers crossed...