Thing's done wrong:
First off your left arm drops too early. Let it slowly drop as you swing up to the ball. Here's a good video on the left arm.
http://www.youtube.com/watch?v=SG7dTkZ-EpM
Next thing is your trophy position, you don't have a clear one. You get to the trophy position, but you have barely anything coiled. When you loop your racket to go down to the backscratch position, your legs load up, but that's too late.
Next is the legs. It's loading too late. You're already past your trophy position and you're about to swing up on the ball as you load your legs (very little loading too).
Next thing is that you're going to the backscratch position consciously. It's not a bad thing to do, but it should happen naturally from having a loose arm and using the kinetic chain correctly.
Your toss is all over the place, you may hurt your shoulder trying to hit serves from that far back. It seems like you're tossing behind you and to the left of you, not good for your serve or shoulder. Truthfully good kick servers toss is in front of their body (not as far in front as flat serves) but aligned with their head, not to the left of it (from back view) so that when they jump into the serve they catch it under their head and their weight transfer is still going forward.
No followthrough. You're ending on your right side of the body and just stop swinging after you pronate. Followthrough all the way across the body so racket ends up on left side of the body. This should also help you get more acceleration through contact and a smoother serve.
Think of the serve as a 1-2 motion (load together, unload together). Start off, as your tossing arm and racket goes up, your body starts to coil and your legs start to bend. At your trophy positon, your racket should be pointing at the sky, left arm up (almost like pointing at the ball), knees bent, body coiled. Then everything starts to unload. Your legs start to straighten, your body uncoils, your arm gets slung back into the backscratch position, and you hit the ball and followthrough (think of it as throwing your body at the ball).