Notice how both of Howell's feet and knees are flared out slightly. This allows him to generate power from the hip flexor muscles and glutes, some of the strongest muscles in the human body. He'll use those later in his golf swing.
Most pros have shifted almost fully onto their trail leg by this position, but Howell stays more centered, with more weight on his lead leg. Less movement can potentially mean less power—but more consistency.
Howell's body is turning, but his head is in an almost identical spot from where it started halfway through the backswing. Many pros move their head back towards their right foot here, but Howell's is locked in place. Another example of how this swing is built for efficiency first.
Remember how Howell pushed his knees outwards at setup? He's maintained that lower body structure throughout the backswing. By making a big hip turn into his right hip he's coiled like a spring, ready to jump.
Howell is driving his hips towards the target with a big push from his right leg, but again, his head has barely moved.
Howell started his swing with his left foot flared out towards the target, and this is where it comes in handy: It creates more range of motion in his hips, so they can rotate more freely through the ball.
Young Charles Howell III had lots of shaft lean at this point. Now, his clubhead, grip, and left arm are all in a straight line at this point. Put simply, Howell is releasing the club more now than he used to.
Howell's head is still firmly down, but his body hasn't stopped turning—that's crucial. Keeping your head down becomes bad advice if it stops your body from turning.
Howell's swing has changed a lot over his long career—but this position looks the same as it always has.