It certainly looks awkward. You shouldn't be needing to toss the ball in that position, especially the way you stand. One aspect you really need to work on is the toss. You toss is MUCH too low. If you are 6' 3" use that body of yours for every inch you are worth and toss the ball higher and make contact MUCH higher. Andy Roddick is 6' 2" and he makes contact at nearly 10 feet, so that should tell you something.
If you watch professionals and they really REACH for the ball and get a good amount of height off the ground because they put so much momentum up and forward that they actually jump off the ground. You get more bodyweight into the shot this way. Also relax out there. The shot looks a bit unnatural and rushed. You should never look rushed on serve, it is the only shot where you don't have to wait for your opponent and you can take all the time you want to set it up.
You appear to be bending your knees too early. This can and most likely will
mess up your toss and make it inconsistent which may lead to producing a lot of double faults. Your tossing arm looks loose. After you toss the ball, you want your tossing arm to reach for the sky. Imagine your tossing arm being a string to a catapult. When you're starting the motion to hit the ball, you "cut off the string" and start bringing your tossing arm back down. While this is happening, your serving arm should catapult up. The toss arm is very important throughout the whole serve.
Watching Roddick in slow motion is always helpful.