Children's party abt 1917-1918

I am pretty sure this is a Hong Kong photo. My mother Iris Maud Hunter is the girl on the far right hand side of the photo. Her sister Nora Eileen is seated in the front row, second from right. They were both born in Kowloon. I don't know where the picture was taken or who the other children are. My family moved to Shanghai about 1919 or 1920 so this shot is borderline but judging by the look of the childrens ages I think it was before the move. My mother Iris was born in 1911 so I'm guessing at the ages in the photo.