https://www.gamespot.com/articles/red-dead-redemption-2-gives-you-a-selfie-camera-he/1100-6461910/

Yet another detail about Red Dead Redemption 2 has come to light--and it has to do with selfies. During our preview recently, we encountered a mission with a character who gave us a camera. You can take out the camera at any time to snap pictures of the gorgeous surroundings, but of course, the first thing we tried to do was take a selfie.

You can take selfies in Red Dead Redemption 2, but not quite in the same way you can in Grand Theft Auto V. Instead of holding the camera and extending your arm, the "selfie" perspective is called "self-portrait" and it shows Arthur Morgan from a further away perspective. Presumably, that's to be era-appropriate, with the camera being set up on a tripod or something of the sort. Still, if you want to snap a picture of Arthur, you do have a means for doing so.