Cartoon showing an artist creating a self portrait.
The self portrait looks exactly like the artist – right down to the pose.
The cartoon is partly about the self obsession of(some) artists and about the self-referencial nature of art and the introspection of artists.
Cartoon showing an artist producing a self portrait that looks exactly like him (including the pose).
The artist is a sculptor and he is carving a self portrait in stone.
The joke in the cartoon is that not only is the sculptor carving a statue, but the the sculpture (the self portrait) is also working on a self portrait too (that is just protruding into the righthand side of the cartoon).
It is a cartoon about infinite regression, where the artist is creating a self portrait that is creating a self portrait that is… and so on. Similar to a mirror reflecting a mirror that reflects the other mire that reflects the other mirror.