Starting to look good. The biggest problem is the toss. The really short toss is affecting every part of your serve. Toss should much higher than that, however an estimation is difficult to give because some players like the ball higher to really set up under it, but some players like it shorter in order to quickly explode onto the ball. But either way, toss is way too short.
Like I said in the other thread, first thing you should do, is be really calm with your toss. Now realizing that you are a lefty, unless you have the video mirrored, you right moves extremely fast which will produce inconsistent tossing. Remember, the toss IS NOT affected time wise by anything else, you can take as long as you want preparing and tossing which you should do because you want that toss perfect and consistent each time. One problem I see right off the bat is you are letting go of the ball very early, even before your hand points to a 3 o'clock position and then you stop your hand there. You want to let go of the ball at about a 2 or 1 o'clock position and then continue moving your tossing hand till it reaches the 12 o'clock position. Watch this video (http://www.youtube.com/watch?v=n76f2KJ36yA
) of Rafael Nadal for example. He starts tossing the ball at about 2 o'clock and then keeps moving his right hand until it is perfectly vertical and right underneath the ball. Notice all that his tossing hand reaches its highest and straightest point when the ball has also reached its highest point. And keep in mind, his ball toss is about a good 4 feet or so above him, and he has relatively one of the lower ball tosses in the game. Again, also notice how steady and straight his arm is the entire time and how relaxed, slow and smooth it is. There is no eblow bend or strange contortion of the arm because all this would lead to bad tosses. Remeber, the toss height is your call, however as a beginner, tossing it as high as Nadal does is very good to start out with. But when you get better, remember that while having a higher ball toss can help you get time to setup better, the higher the ball more difficult it is to be consistent and the more chance it can be affected by the wind.
Your feet and coiling motion actually look quite solid for a beginner. You have the basic idea of coiling as soon as your hand starts going up past the 3 o'clock position. If you notice Nadal, he does the exact same thing. However the biggest problem is that your weight is not going directly into the ball and you are losing quite a bit of power because of it. Since you have been able to actually lift off the ground serving, what you want to do is really aim your body and plant foot, which in your case is your right foot, towards the service box you are aiming. If you watch Nadal's video, he does an excellent job of this even though he starts out quite sideways with his stance and feet. When you land, you will want your plant foot point directly towards the service box. You almost do have this, but the rest of your body is still quite sideways hence it is why you end up "spinning" your other foot in.
So remember these are the key points you should work on-
1. Let loose of the ball at a higher point and be slow/relaxed with the tossing hand
2. Have a higher toss
3. Continue with tossing hand towards straight up to the sky
4. Start all your coiling and such (back is not necessary by the way) while you are just about to start progress with tossing the ball
5. "Scrunch" all your energy right underneath the ball and then when the ball is a split second about to reach that perfect height, start uncoiling everything. This is important, do this too early and you completely whiff the ball because it is probably too high still. Do it too late and your handle hits the ball instead. You want to give yourself a good amount of time to uncoil everything to transfer the weight into your racket and then hit the ball.
6. The tossing hand is very important in all these steps. It starts the whole motion and when it is coming down, everything uncoils up instead.
7. Put your weight up and forward, almost like at a position between 10 and 11 o'clock.
Good start nonetheless.