Sergi Brosa is a Spanish concept artist and illustrator who works mostly as a freelancer and on comission pieces. Why a comic publisher or video game studio doesn't have him on their books escapes me, because Sergi's stuff is insane.
Be sure to scroll to the last image. Then... keep scrolling. If you can.
You can see more of his work at his DeviantArt page.
Fine Art is a celebration of the work of video game artists, showcasing the best of both their professional and personal portfolios.