Nicolas Bouvier aka Sparth—whose latest work is being art director for Halo 5—is getting better all the time. His private work is so optimistic and far away from the usually gritty and dark vision of other authors. And I love the fresh use of geometry in some of his most recent art.
Some extreme examples:
This one reminds me of Jean Giraud:
Even in the dark, his worlds feel clean:
Nicolas Bouvier is a French illustrator and concept designer working for Microsoft in Seattle, Washington, where he most recently was art director for Halo 5. He's been working in the videogames industry since 1996, working in Halo 4, Assassin's Creed, RAGE, Prince of Persia, Alone in the Dark 4, and about 80 book covers.