Dark Lord by Liam Brazier
One thing's for sure, Liam Brazier's lack of curvey lines certainly does not disturb the Sith Lord. Check out more of his uniquely angular illustrations here: Link (don't miss the Cave Man one!)
See also: Neat Star Wars stuff from the NeatoShop
What is interesting about this kind of artwork to me is that it demonstrates how our minds make sense out of images. The artwork here only represents those aspects of Vader that are required to trigger a recognition of Vader and little more. There is no extrenuous detail in the picture, just a bunch of jagged and colored shapes. But the mind recognizes it as Vader anyway.