Sorry, found another three...
Dad on the right, and Max Green, the chess player on the left. Note on the back says, 'taken at Bot[anical] Gardens Lake, 30 Dec, '34, by Bobbie. {Another chess player.]
My mother and father on their wedding day. This appears to be the full photo of the one that is in an earlier post. It was taken by Artophot, 276 Lonsdale St, Melbourne. The woman in the background would have been the bridesmaid, most likely. If my memory serves me rightly, her name was Molly, and she and my mother wrote to each other for years.
This is also a wedding day photo. Even though Mum appears to be wearing different clothes - at first glance - she is, in fact, in the same dress and hat as in the previous photo. There's no indication what studio this was taken in.