You are agood enough archer to know what works for you,that is what is important.
The video that rick/matt posted in gmmat's post on thumb triggers is just about perfect.IMO
http://smg.photobucket.com/albums/v283/ringostar40/Archery%20Competition%20and%20Form%20Pics/?action=view&current=24958d05.flv
In my pics my head/chin is higher than yours and rick's is somwhere in between both of us,which I feel is considered "perfect".
Looks like you really have the front shoulder loaded,ALOT, and it is working up on you.I personally can't shoot like that but whatever works.For hunting,I like what I see,for serious target shooting,there would be some slight adjustments made if you were to see a coach.
A coach would probably lengthen the draw and that would fix the front shoulder and the chin would probably take care of itself.He would also tell you to make your feet wider(under the shoulders).I really doubt he would pick on anything else.
I have tried the front shoulder loaded like yours but it just didn't work for me.
I am actually going to work on bringing my head down a bit after hunting season.
IN NO WAY AM I SAYING YOU SHOULD CHANGE ANYTHING,BECAUSE IT WORKS,BUT IF YOU WERE TO SEE A COACH AND WERE TRYING TO GET INTO THE UPPER CLASSES OF ARCHERY(PRO CLASS)THESE ARE SOME THINGS I FEEL HE WOULD LOOK AT.