Adam, question #1, are you hitting what you are aiming at? If not, do your shots go any particular place in general?
It's hard to tell from a static picture from just one angle(video is always much better because you can see the whole shot in real-time).
From just the pic you posted, I'd say it looks good: Some people find they shoot better with a slightly less than locked elbow, yours looks locked completely (could just be the pic); your drawing elbow looks just a bit high...nothing too severe on either, but you may want to try some variations to see if even minor variations may bring about some improvements.