The picture is of my great-grandfather Thomas Fitz-Henry, whose older incarnation can be seen in the photo in the first post I made on this blog. It's a scan of a "tintype" photo, the original instant snap. More about tintypes can be found here at Wikipedia
I think Thomas must have been in his late teens or early twenties here (he was born in 1870), and I'm told that this would have been taken outdoors in natural light against a white background. So he was either standing outside during a competition or it might have been at a bout at a fair where traveling photographers were popular.
In February 1894 he won a silver cup at the Sydney Club Open Boxing Competition weighing in at 7 stone 10lb (108lb) or flyweight. The trophy was never engraved with his name as it was more valuable at the pawn shop unnamed (family legend) but thankfully it was safely redeemed so I now have it.
The picture may have been taken at that event as this is the only photo we have of his boxing career.