I tend to do faces a little later in the process, since I layer paint on the largest surfaces so recklessly. (The process inevitably gets at least a little bit of paint on adjacent smaller areas, so I do them later.) That said, yeah, the face really pulls a good miniature together. Mine aren't remotely as good as yours, or some other folks on this forum, but even so, I really enjoy the faces of a good, hand sculpted model.
And Padre, I love your practical effects. They're brilliant. I've done some blue screen for my space ships, and a couple of times for bridge shots, but your real interiors with real stuff and really making the miniatures look like they're sitting at a table or what have you . . . it's brilliant. No green screen could ever equal that. I admire the absolute crap out of it, and I need to do a little more of it with my space story.