I'm a huge fan of LOST, and I love what you did here. Portraits are kind of my forte, and you're better than I am at doing them, hahaha. But seeing your WIP made me learn a thing or two about how to improve. Great job on Sawyer, it looks like a still-frame from the show. And I love his face in the first frame, hahaha.
Strangely enough, these three frames here show his progression of a character over the course of the show. Because at the beginning, is very much the doofy, pissed off guy that you illustrated in the first frame, but by the end of the show you really see a soft, humbled man.