I read somewhere, though, that sometimes comic book artist do it on purpose as a sort of homage or to purposely allude to a popular image or issue. Maybe it's just an excuse, or maybe it's valid. Maybe it's a matter of how often one does it or how one pulls it off that differentiates homage from laziness.
I wonder, though, each of those characters has been drawn and redrawn so many times by so many people, despite the range of body motions argument, after a while can they be drawn any other way? Of course they could, but is that what readers want? People expect the Spidey swinging through the city or Wolverine or the Beast jumping, slashing and snarling. Maybe it's that these comics are just getting predictable, artists' styles don't stand out as much, or readers are too easily pleased.
Swipe of the week is a neat site. The Battle Angel example surprised me. I thought Battle Angel was published in Japan earlier, but that was 1991, still postdating Elektra. Wow.
That made me wonder, if one copies a pose from an existing comic or photo but draws it in their own style -- not just tracing it directly -- then is that acceptable?