How to make shoulders move along with head? (see attachment)

Are the arms independent and attached with the weld attach style to the torso? If so they shouldn't disconnect. See Chloe on the CH home page as an example of how we set arms up normally. If it's set to weld the arms should feel like they're welded to the torso at their origin, which we advise to put at the shoulders. The fixed handle trick you're using is great for helping to pin down corners more. Most times I make my arms have a little extra rounded overlap area so there's not a straight edge sticking out on them.