Nice find Annette, it does appear to be EJD on the census. Thank you all for the research and suggestions ... I ordered the death cert for EJ Hughes; unfortunately nothing conclusive.
She was 52, Presbyterian, born in Hampshire to Mr. Ramsay, a farmer. This Elizabeth was either a Ramsay by birth, or her husband didn't know.
She married Thomas Herbert Alfred Hughes in Johannesburg, SA when she was 34 (abt 1907); and had lived in Qld for 16 yrs. (since 1910). Interred Mount Morgan cemetery.
I also read the articles about T.H.A. Hughes' death shortly after her death and couldn't find anything to add or confirm.
Nothing further from the family regarding immigration records or year. They did send a scan of the back of the photo (below).
http://www.rootschat.com/links/01eoa/It appears Chas. Johnson may have been a photographer (attached his stamp).
Written message to the daughter of EJD on the back of photo: poss written by Aunt Mary Jones.
"Your step-father and mother on the verandah of their home which he built ten or eleven years ago."
I read in one Qld newspaper that Thomas Hughes was a builder, dairy farmer etc.
The grandson of EJD has a letter dated 1949 written to his mother in Canada from his aunt Mary (Nicklen) Jones of Elim, Breamore. A probate notice in 1950 confirms Mary's address in Hampshire. There was no news of EJD in the letter.
Thanks again for your kindness and for your time, I'll keep searching

Kate