Not sure I can be anything like complete,
e_r, but here's a start about photography at 312 S. Main.
As we see, nothing doing until 1915. (Spellings vary as in particular years' CD):
1911 CD: Henry Argue, Fruits, at 312 S. Main; Crescent Creamery Co. at 312 ½ S. Main
1912 CD: Chris J. Rapp, shoes, at 312 S. Main.
1913 CD: Lavin & Tuck, fruit, at 312 S. Main.
1914 CD: Trunk Factory, and Fruiters, are at 312 S. Main.
1915 CD: Barzillai [sic] S. Ansley, photo[grapher] is at 312 S. Main (as is Enterprise Trunk Factory).
Some 1915 ads:
LA Herald, 3/25/1915
LA Herald, 8/3/1915
LA Herald, 11/19/1915
1916 CD: Barzillia [sic] S. Ansley, photo, at 312 S. Main. As is Harry Simon, tailor.
1917 CD: Barzillia S. Ansley (Sheffield Cain & Asnley [sic] at 312 S. Main.
1918 CD: Barzillai S. Ansley at 312 S. Main; Mrs. Lena Swayze, soft drinks, at 312 ½ S. Main.
(evidently no 1919 CD)
1920 CD: Ansley Commercial Photos at 312 S. Main, Rembrandt Studio at 312 S. Main; Raymond B. Swayve [sic], soft drinks, at 312 ½ S. Main.
1921 CD: Ansley still there; Swayze still there.
1922 CD: Ansley still there; Samuel Goldman, soft drinks, at 312 ½.
(I didn't trace it further . . . )
Edit Add:The photo has a definite "Mack Sennett Bathing Beauties" vibe to it for me...
Later Edit Add: Ah, here we are.
A Social Cub of 1916 from Sennett, with Bobby Vernon and the well-known comedienne Gloria Swanson:
IMDB https://www.imdb.com/title/tt0007364...wer/rm64948480