I'm hoping the collective wisdom can help clarify something I've discovered in some old family photos.  I've been delving into dozens of older, unidentified photographs which have come my way over the years.  These are studio portraits, many rather small, about 1"x2", mounted on heavy card stock, and some with Cyrillic labels.  I've managed to decipher some names of cities and areas – Snovsk, Gomel/Homel, Rechitsa, Vitebsk, Minsk – in addition to references to the photo studios.  However one in particular, labeled in English "Visit Portrait," got me wondering whether these photos represent travel mementos.  Were they taken at the site of the visit or at home to be given to hosts when visiting?  The difference might indicate whether or not the named town was the individuals' hometown.  Is anyone on this list aware of such a tradition?   Thanks for your help.
 

Lee David Jaffe
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Surnames / Towns:  Jaffe / Suchowola, Poland ; Stein (Sztejnsapir) / Bialystok and Rajgrod ; Roterozen / Rajgrod ; Joroff (Jaroff, Zarov) / Chernigov, Ukraine ; Schwartz (Schwarzstein) / Ternivka, Ukraine ;  Weinblatt / Brooklyn, Perth Amboy, NJ ; Koshkin / Snovsk, Ukraine ; Rappoport / ? ; Braun / Wizajny, Suwalki,  Ludwinowski / Wizajny, Suwalki