To me, it looks like you're not hitting full expansion and likely not getting into your back as good as you could be. I notice that you're starting your draw by sticking your arm out at the target and pulling straight back. When you do that, your spine has no choice but to contort a little, pulling your head closer to the target. Your head comes into a little better alignment by the time you hit anchor, but it still looks like you're selling yourself a little short. If you get your head in alignment with your spine in that plane, itll allow your draw to be more consistent, increase your draw length, and allow you to more easily get good tension in your back.
It's a little tough to tell with the shirt, but your bow arm shoulder might be getting pushed up and into the socket a little. If that's the case, it could be shortening draw length and create pain issues down the road. Keeping the bow arm shoulder low and forward will be a solid position, and keeping the elbow bump rotated outward will help create bone-on-bone alignment for stability.
Regarding anchor, I definitively think you could come back a little further. When I did a session with Arne Moe, he had me focus on expanding until I was in the correct alignment, and then finding anchor points that match that position. In general, with higher anchors like we use for bowhunting or barebow shooting, it can be tough to get great back tension, so it could take some experimenting. Lots of guys sacrifice some alignment in order to get the arrow closer to their eye. Others will crawl down the string with a lower anchor, which also gets the arrow closer to their eye.
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