Concept artist: Ryan Church
Recently I found the site from Ryan Church where he displays some of the concept art he made, like this one he made for the movie: John Carter. I love it!
Ryan Church is an artist who makes concept art for movies and recently also games. He has quite an impressive portfolio, which I recommend you to watch if you are into science fiction imagery. I found it when I was browsing the web and found out he made some great artwork.
Not much later I also found his artwork for a game called Star Citizen. A game which I pledged for (Kickstarter) and for which I have high hopes. Later on I'll also post some artwork from Ryan for that, but first this image he made for the movie John Carter and which I used to create some thumbnails from.