The thing that makes the shoulder blades tricky is that they seem to change shape depending on the movements of the arms. If you're going for realism, high-end programs would likely have a solution for this. In Poser, I'd compromise and forget about it since there are much bigger problems to attend to. The body shape is looking good. You appear to have talent.

Download my free stuff here: http://www.renderosity.com/homepage.php?page=2&userid=323368