Overall, I think your mechanics look pretty good. If you’ve developed yourself based on reading books, you’ve done a great job picking out the best practices from those books. Which book influenced you the most?
Here’s some specific things:
(1) Posture and balance look pretty good.
(2) You could probably stand to get the hips going a little sooner/faster to build up more momentum. That might translate into a little more velocity and getting into foot strike quicker will help prevent you from opening the shoulders too soon. (This is Tom House stuff.)
(3) As Dino already pointed out, you’re front arm/glove could be extended out over the front foot more. It will hold this position only for a moment at foot strike. Then, as the shoulders rotate, the glove will turn over (and elbow will swing down and in front of the torso). The chest will move to the glove. (This is Tom House stuff. too.)
(4) Your front foot starts to open early in the stride and that will cause the hips to start opening early too. Some folks believe that rotating late into foot strike will give you a more explosive rotation of the hips. And that will translate into a more explosive rotation of the shoulders. (This is NOT Tom House stuff but I believe there is some merit in it.)
(5) You seem to get good hip and shoulder separation.
(6) Your shoulders do appear to start rotating a tiny bit early. In fact, there doesn’t appear to be much delay between hip and shoulder rotation. The shoulders come around at about the same time as the hips. Try to keep the shoulders closed longer while keeping the head and shoulders stacked upright and tracking forward with the torso. This will let you use the body to throw more and take some stress off the arm. It will also get your release point closer to home plate.
(7) Finishing your follow through with your glove toward the 2B side of your body makes it next to impossible to defend yourself against a line drive hit back at you. I try to get my pitchers to keep the glove in front for self-defense.
Just so you know where I am coming from (in case you couldn’t tell :roll:), I am a Tom House certified pitching instructor. So, yeah, I am biased from that angle.
By the way, if you want to learn the latest Tom House teachings, get his latest book, “The Art and Science of Pitching”. It is much more in line with what he is teaching these days than is “The Pitching Edge” though a lot of that is still valid.