Yohann Schepacz, aka OYO, is an atist who works at Sixmorevodka, a studio whose work we've featured here on Kotaku before.
Sixmorevodka is based in Berlin, and has provided concept art for clients like Blizzard, Sony, Nintendo, Ubisoft, EA, Disney, Marvel and Warner Bros.
The gallery below contains a bunch of both Schepacz's personal work, as well as some pieces of fan art. You can see a lot more of Yohann's work at his personal site.
To see the larger pics in all their glory (or so you can save them as wallpaper), right-click on them below and select "open in new tab".