There is a LITTLE funk going on there but it's subtle.........The draw length may or may not be a little short. Your weight distribution looks to be a little off. You are dropping your body weight almost completely over your back leg as evidenced by your right knee being locked straight and your front knee in a relaxed position. This is causing you to lean back slightly into the draw.

That all may be caused by your bow arm........that exaggerated bend in effect drops your anchor further back and to compensate your body and and head will drift backward to find it.

Get the bow arm a touch more extended and I think that will make everything chase forward where it belongs in a better vertical position.I think that slight change will really improve not only the appearance of your form but your ability to hold steady. It all starts with a solid base and proper weight distribution.
Think Vertical "T" . Straight up and down head over shoulders over feet.

Also with that form you will naturally have a tendancy to drop your bow arm rather than bend at the waist when shooting from an elevated position.

Like I said, get the bow arm a little more straight but not locked, (I do like the dropped shoulder position) and everything will move forward into better position.
Shooting with your current form I think a change to a longer draw length would actually make things a little worse in your particular case.