Hey, you're doing pretty good with your form. I would shorten your draw length until you could relax your bow arm elbow. It should be slightly bent, instead of being forced out. Your grip should be completely relaxed, not tight. Do not force your hand open either. Just relaxed. You will not have a perfect T shape when using perfect form either. Your bow arm shoulder should be lower than your release arm shoulder. That would make one side of the T higher than the other. You should be striving to hold the bow at full draw with your back muscles. Doing so allows your other joints to relax and be more stable. This in turn lets you have a solid comfortable aim. At the same time, you should learn how to trigger the release with back tension, you'll really become deadly.
Good luck.