An artist at Valve called Drew Wolf updated his online portfolio with art concepts from an unmade game.
Wolf describes the process of the art concept saying, “During the development I created a mood sketch for each character. They were done in [the style of] a classic sci-fi/fantasy book cover. Each sketch represents a slice of the world each character came from, as well as a hint at who they are and what they do. This collateral art helped convey the direction quickly and facilitate creative discussion for each character.”