In case it is helpful, I'm attaching an article (in Polish) that briefly outlines the history of photography in Lomza. It mentions on p. 217 that the city's early 20th c. photo studios included two Jewish photo studios: "Foto-Rembrandt" (located at present-day 22 Lipca Street; the studio where your photo was taken) and "Bernardi" (at the intersection of present-day1 Maja and Armii Czerwonej streets. Either one or both were run by Leon Jesionowski.
Robert Murowchick <robertmurowchick AT gmail.com>
Researching these family links: