It looks like your leaning back and then your head is leaning into the string. It looks like if you shortened up your DL a tad, you could straighten your back and get in more of a straight line.
Here's a pic of my form...I'm not saying that it is perfect or anything close to perfect but it seems that you look a bit uncomfortable in that position.
But hey if your shooting good, you'll be plenty good to get one in the vitals and thats all that matters.
