Static vs. dynamic poses: depends on the miniature itself. For a dynamic mini like a charging orc or a dueling swordsman, I\'d prefer an \'action pose\' with hair flying and weapon swinging. That said, there is something to be said about the dramatic impact of a less \'quieter\' pose. However, even with a static pose, I always like to see and enjoy painting a figure with at least a little motion, wind billowing a cloak, a subtle step forward, or even just a<i> contrapposto</i> pose (Michelangelo\'s<i> David</i>, Donatello\'s<i> St. George</i>) rather than a completely squared, hands-at-the-sides, forward-facing figure.
Teenage Mutant Ninja Turtles aside, I guess it depends on the personality of the mini as a whole, taking into account costume, props and equipment, etc.
E-Arkham: I think there is a place for miniatures with bowed heads or lowered gazes. It can add something to that dramatic, moody atmosphere, even if it does make the face hard to paint or see.