I like your anchor position in the third position. However, I really like the low shoulder in the second. If you shot split fingered, you could get the best of both. It's tuff to see without an overhead picture (a video would be much better), but it looks like your draw elbow is not rotated around back far enough. Try doing this, point your draw elbow perpendicular to the bow before drawing, now draw keeping the elbow in this position, can you hit anchor? Yes, but it will be only from using your arm muscles. To finish it off, the elbow has to rotate to be in the same line as the arrow. If the drawing force is not from directly behind the arrow, you will have a tendency to pluck the string. Only way to get it back further is back tension. Picture looking at an overhead: Your draw elbow should be direct opposite from the point of your arrow and a straght line should be seen from the tip to the back of the elbow. Your shoulders should be parrallel to this line.

Other thing I can see is tension in the draw hand. This must be relaxed or you will not get a clean release. Try to think of the fingers as a hook. A good excericise is to get a full can of paint. Pretend the handle is the string and just hook it to pick it up. No tension especially in the back of the hand.

Looks good!