Shoulder adjustments - forward shoulder or square shoulder?

Joy asked me about the wrinkles at the front of my daughter's blouse shown in the last post. I agree, the photographs did look as if a forward shoulder adjustment was needed.
Unfortunately, in the photographs of the last post, my daughter had adopted a forward shoulder position. I have asked her to replicate this posture for the following shots. She did not find it at all difficult.

As she is 13 years old, this is not yet a fixed position, and I am not planning to adjust garments for it. Instead I will constantly berate her about her posture, which is my duty as a mother ;). Eventually, she can learn to make her own forward shoulder adjustments, unless all the ballet and berating pays off.....
Here are the wrinkly bits Joy was talking about that are due to the forward shoulder position (point of shoulder in front of ear, shoulder blades stuck out like wings)



You can see that when she adopts a neutral shoulder position (point of shoulder level with ear, shoulder blades flat against ribs at back) there are fewer wrinkles, but some remain.



These are the wrinkles I think can be fixed with a square shoulder adjustment.

I believe that a square shoulder adjustment is needed, because when I pin out the shoulder seam so that the taper towards the shoulder is less, the wrinkles at the front diminish.

Naturally, when I square the shoulder, I will be adding to the shoulder end, not taking away from the neck end.
I will not make this change for this particular blouse, but will try it for the next item.