A Wikimedia Commons editor stands in front of an old phone that he taped to a wall and waits 5 seconds for it to take his picture. Backlit and cropped badly, but that's not the point; the point is that it is perfectly, trivially, possible to appear in a photo you took yourself, with both hands visible.
<a href="//commons.wikimedia.org/wiki/User:GRuban" title="User:GRuban">GRuban</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>