On recording video, shoot the down the line view, down the TOE line, not behind the golf ball. Its hard to tell the position of the clubhead when its off the toe line.
This is on the last swing (were you are wearing black)
Head down, you want to be looking at the ball through the center of your eyes, not down the bridge of your nose. Besides that the posture looks good.
Two examples, of Robert Allenby and Hunger Mahan. Your posture is pretty good, just need to get that head down more. For you it might almost feel like your chin is near your chest.
You rotate on too shallow of a shoulder turn. Need to get a steeper shoulder turn. Here's a good instructional video on describing the Steady Head key for the golf swing. You can see Erik describing how his left shoulder goes down. you can see with your swing your shallow turn also causes you to fall what looks like towards the target at the top of the swing. If you want a good visual, your shoulders should be pointing a few feet past the ball. Your's in that swing is pointing off screen. So you can get a lot steeper and be OK.
A little bit of a wider stance, you get a bit of knee sway in the golf swing. You start to tilt towards the target when you get near the top of the backswing. Also flare the feet out about 30 degrees. This will help with hip turn and stabilizing your knees more. The knees should be pointing slightly outward.
I would work on getting that head steady more. Once you get that solid you can move on to more of getting those impact conditions better.