sssnap, I don't think that a low drawing elbow is "common" unless you watch a kid the first few times they try to draw a bow. Bobco poits out -- and I agree-- that your avatar picture is a good position. Another important part of this is an overhead view. Your drawing elbow, forearm, string hand, arrow and bow hand should be essentially dead straight as seen from above.
As I mentioned to Bobco, it is really hard to prescibe corrections by word. If you can, find a coach to check your form out.
Form faults "sometimes plague" all of us. Humans are not perfect every time. If you recognize the problem and can correct it, you're nearly there. It becomes a matter of figuring out a way to guard against the occasional - oops.