At one time "Game of Thrones" and "Conan the Barbarian" actor Jason Momoa was slated to play Drax the Destroyer in Marvel's "Guardians of the Galaxy," a role that ultimately went to Dave Bautista who surprised everyone and stole the movie for some.
Momoa opted out of the role back in February 2013, a month later Bautista came onboard. So, at a point in late 2012/early 2013 when pre-production was partly underway, it was expected Momoa was going to play the role. At the time some very early concept art was being created and Momoa's likeness was being used for the Drax sketches.
Today, Marvel Studios concept artist Andy Park has released a shot of his work on designing Momoa as Drax, a Drax that sports a very different look to the one Bautista ultimately had in the final film.