It appears that Yeoman's were photographers from c. 1895 onwards.
The Yeoman's central studio was gutted by fire in 1912 in Bourke Street. (see below)
The State Library of Victoria has several examples of their photos. So your photo would date pre 1912.
http://tinyurl.com/3oyf5weThe Argus (Melbourne) 5th February 1895The Photographic exhibition.
The notice in our issue of Wednesday of the Photographic Exhibition now being held at the Exhibition building ~
Messrs. J. Yeoman and Co. show well selected opal and bromide enlargements, family groups, and a wide range of views taken in the country districts.
http://tinyurl.com/448cupbThe Advertiser (Adelaide), 2nd December 1912A fire accompanied by sensational incidents broke out in Bourke-street, shortly after 10.30 yesterday morning. Two stories of a three-story building occupied by the Sutton Proprietary, the J.D. Williams Pictures, and
Yeoman and Company's photographic studio were completely gutted.
http://tinyurl.com/3mlkuo6The West Australian, 6th July 1914, p7 Mr. R. Yeoman, photographer, of Bourke street, Melbourne died in Elsternwick. His death removes from the city one of its oldest and most respected business men. He was an ardent sportsman, and many years ago was a prominent figure on the hunting field.
http://tinyurl.com/3bypz9r
