Possibly Australian trooper, in what appears to be a warm weather tunic, bush or slouch hat with the rim down, crossed rifles on left sleeve suggest marksman or sharpshooter, some form of service stripes or good conduct stripes on sleeve, can't make out the collar dogs, knife tucked into belt,
Child looks like an Islander as opposed to Aboriginal, maybe Torres Straight Islander, There was occasionally outbreaks of violence by Aboriginal and Islanders in various parts duting the latter decades of the 19th century, Some one may be able to identify the shotgun and if it was issued to troopers, certainly shotguns were issued to British and Anzac troops of the Malayan campaigns in the 1950 and 60s, Alternately post it onto Armed Forces board experts on there are second to none (Nulli Secundus)
Regards
James
