I don’t know anything about video games so I don’t know anything about Turok except that it has some kick-ass concept art from Mandryk. Big guns, bigger dinos, classic scifi jungle adventure! Mandryk has posted a massive amount of Turok art on ConceptArt.org, including character studies, storyboards, vehicle designs, weapons designs—all in all, an interesting look into what it takes to create a game, visually speaking.
Also check out Mandryk’s website and Tor.com gallery.