This might be of interest to some. A blog called Film Sketcher has posted up some unused concept artwork for John Carter by famed sci-fi and fantasy artist Wayne Barlowe as well as a brief interview http://filmsketchr.blogspot.com/2012/03/exclusive-unused-john-carter-concept.html. According to Barlowe he only worked three weeks on the film, mostly on the Tharks, and none of his work was used on the final film. So take a peek and see what you think. Also I found this brief interview with Barlowe where he talks about his work in art and filmand yes there is a brief clip from John Carter so go figure.