The rear observer in a photo taking position. He's holding a Type 100 hand-held aerial camera, standard equipment for the "Dinah".
A rare view of the observer's position showing the Army type 99 Hi Mk 1 radio. The transmitter is on the top and the receiver on the bottom.
According to the caption, the photo above was taken after the crew had returned from their mission over Okinawa. Note that the observer is wearing a life-vest, only natural for missions over water.
The caption of the photo above mentions that the films are being developed...