Wow...for the first time I pretty much totally agree with c903!

There are alot of fine points that he brought up which alot of folks might miss but his last statement about being comfortable and consistant is also right on the money.
The one issue that jumped out at me initially was what someone metioned above...you are leaning back a bit more than the classic "T" position. Sometimes this can be indicative of too long of a draw length but I do not see any other signs that would lead me to that same conclusion.
You can correct this simply by having someone watch you while you are at full draw. They can "straighten out" your upper body slightly. You can then 'feel' the difference eventually on your own. You could also use a mirror but then that may hinder development of the rest of your form as you then tend to always be peeking into the mirror instead of mentally addressing other issues.