Haha sure dont worry
Yeah I have the same issue where I cant like stuff anymore due to some server error.
1: the shadow here points to the origin of the deltoid and the trapezius
2: the insertion is hidden because the upper arm is rotated + like in picture C the triceps pushes the deltoid up
1: trapezius attaches more laterally
2: draw a soft curve instead of a hard edge
1: when the upper arm is rotated internally the deltoid insertion moves forward (in this case away from the viewer)
2: the triceps pushes the deltoid up