If you haven’t already heard of Stanley Chow, make sure to check him out; his work is great. His illustrative portraits are brilliant, and I love his use of shape rather than line. These could be really nice prints. He has been all over magazines and publications, all well deserved. Here are a few of my favorites:
SketchbookJack 
Amazing how he can capture the peoples’ faces so well using so few shapes and tones. And ohmygoodness David Beckham’s face looks ridiculously angular and chiselled