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Jemima Murray-Prior
Thomas Murray-Prior married (1) Jemima Dickson at Millbrook, Southampton, England on 28 November 1812.1) Jemima's father was presumably also in the military forces as he was Captain Dickson Esq. of Prospect House, Southampton. She had been married for a nearly five years when, on 5 November 1817, aged 26, she died. She died at, and was buried at, Dover.2)
TLM-P related the story of the marriage as told to him by his step-sister Jemima. She told him that, when their father was 19 years old, he had seen Jemima Dickson in the street and declared to his companion that 'if ever I marry she will be my wife'. They became acquainted but then he was ordered to Spain with the army; they married on his return some 3 or 4 years later.3)
Jemima and Thomas had three children: Jemima Frances Sophia; William Amherst born in London in 1814 or 15 and dying when still a baby; and Louisa Elizabeth Catherine.4)
As her family home Prospect House, indicates, Jemima Prior's family were comfortably off. Her brother reinforces this assumption as, when he died in the 1870s, he left bequests of several thousands of pounds.5)
Portraits of Jemima Prior6). 
The next portrait is a larger (920 x 640cm) version of the one above.7) This one was damaged by removalists in c.1960s, and has since incurred further damage. There doesn’t seem any reason why TLM-P would have a photo of his father’s first wife to Australia unless, as M. Therese M-P suggests, the family paintings were all bundled up and shipped off together. Kerry Heckenberg8) suggests that the family portraits were brought to Australia when TLM-P's parents visited him in the early 1850s.
jemima damaged photo - probably need to take again to fix orientation.