You may want to take another look at the trapezius as well as its height. It looks like there's a dent that shouldn't be there in that first pic (could be the lighting). It also seems to ride higher than it should in that first pic, making no clear transition from trapezius to neck. Also watch the obliques, that should be a smooth transition toward the back and it looks like a small dent made its way in there.

 

FYI - if you leave him at the 45 pose, he's not going to work easily with Walk Designer. That's the primary reason we have everything in a T pose. You can model him initially in the 45 - I find I like doing that - but if you plan on folks using him with walk designer and want to save some anger, you'll want to reposition his arms before you start the rig.