Unsubmitted art challenge

Here's something I was working on for the "A Princess of Mars" art challenge on theArtOrder.com. I wasn't able to pull it together with holiday travel but I enjoyed revisiting some of my favorite Edgar Rice Burroughs characters. It is still a work in progress. This scene is from the beginning of chapter XXIV  when John Carter comes to the aid of Tars Tarkas after his flyer crashes in the midst of a great battle between Tharks and Warhoons on the plains of the red planet.
http://www.cs.cmu.edu/~rgs/pmars-XXIV.html