The only representation of Luigi Bianchi on the web is a sketch of some kind, see Wikipedia.it
The following unpublished photo is from the historical archives of the Italian Istituto per le Applicazioni del Calcolo "Mauro Picone" of the Italian Research Council, an institute for applied mathematics founded by Luigi Bianchi's student Mauro Picone,
and a better official one from the same source:
Director of The Scuola Normale Superiore di Pisa 1918-1928. This is clearly the source of the extremely low resolution image at the top of this page. Here is a 228K version, thumbnail linked.
