DOTA 2 is, of course, the Valve-produced sequel to Defense of the Ancients (DOTA), a mod of real-time strategy game Warcraft III: Reign of Chaos.
Lau's latest work is a series on DOTA 2 heroines Lina, Crystal Maiden, Windrunner, and Drow Ranger. You can see them in the above gallery. Remember to click on each photo's lower corner to expand the image to its full size.
If you want to see more of Lau's wonderful art, check out his Deviant Art page.
DotA2 Heroines by 'Artgerm [DeviantArt, Thanks Alex!]