Attached Link: http://www.renderosity.com/viewed.ez?galleryid=995574&Start=1&Artist=evanime&ByArtist=Yes

I really like evanime's work so check out the rest of his gallery too. I dont' know how much is postwork though or how exactly to get that result. Maybe she/he can shed more light on how they do it. My results are nowhere near as good as that but I rely mainly on the toon shader nodes, a pack of toon shaders I got and modified is this one: http://market.renderosity.com/softgood.ez?ViewSoftgood=29666 Lighting is also very important to get the shading you want.