(you have a nice backgrund on your pics. The door is real vertical. To get a nice horizontal line you can use it as guide.)
Draw a line from the left shoulder tip (horizontal with the back ground help) over to the right side and you will experience that you will not meet the right shoulder tip - the side is hanging.
Now a pic is just a pic and if can be that you are not standing flush to the wall. Maybe rotated a bit the right side to the front then you take this with a grain of salt.
But in this pic it is the case. And if I take the neck left and right side with the 2 | | the center which should be right between them is not. The back center notch of the collar will not be at the right place. It could be that all has been distorted by this long long fitting process. I think let it be, we will do it with the next example and now proceed with the sleeves. Do just the left one this side looks trustworthy. And is a good base to get the right one right.