Spike,
It's really tough to tell from just static pictures. But, compare the string arm shoulder position in both photos. See how much farther to the rear the first picture shoulder is compared to the second? I would appear to me that if you were to pull that shoulder back more ( don't worry so much about the elbow but concentrate on that shoulder), your elbow will come around more. Working on this with a lighter bow will help at least at the beginning.
Notice too how much more you are "hunched over" in the second picture. Remember to pull with your back, not the biceps. An arm draw will almost always make your elbow move outside the arrow line.
You may also want to do this in a mirror, you will be able to see your own alignment which may help you.