Russell Schweickart taking photographs from outer space durig the first two-man US walk, 3-13 March 1969

Vintage chromogenic print on fiber-based paper, printed 1969, numbered "NASA AS9-19-2983" (NASA MSC) in red in top margin, with "A KODAK PAPER" watermark on verso, 20,3 x 25,4 cm

David Scott took this photograph from the open hatch of the CM Gumdrop docked with the LM Spider as he had clambered partially outside for a stand-up EVA, still hooked to the spacecraft through a life support umbilical system.

Russell Schweickart is wearing an Extravehicular Mobility Unit (EMU) including a Portable Life Support System (PLSS) and an Oxygen Purge System (OPS) on his back.
The EMU provided communications and oxygen as well as circulating water through the suit to keep the astronaut cool, eliminating the need for an umbilical connection to the spacecraft. A 25-foot-long nylon rope was the only connection that kept the astronaut from drifting away.
Schweickart has his feet placed into specialized gold-painted foot restraints affixed to the front LM porch dubbed the “golden slippers”. His visor reflects the docked CSM/LM spacecraft and the Earth. He is himself taking photographs (of his photographer standing in the open hatch of Gumdrop) with the Hasselblad camera in his left hand.

Russell Schweickart was originally to transfer to the CSM Gumdrop for a rescue simulation to verify a way of getting from one spacecraft to the other if the tunnel were not available.
However he stayed with Spider in part to avoid stress after his previous space sickness and this step was not completed beyond evaluating the specific extravehicular transfer handholds which Schweickart found to be easy for maneuvering.
Mission Control considered this first, and the only one before the Moon landing, test of the spacesuits and PLSS a complete success.

From the mission transcript during the EVA:
073:09:19 Scott (Gumdrop): Why don’t you say hello to the camera or something?
073:09:23 Schweickart (PLSS): Hello there, camera. Boy, is this great!