Heres some pics to get a better look at what im talking about..









At a glance it doesn't seem like theres hardly anything wrong but if you look at the left side around the trapezius area the gap between my shoulder and my neck is smaller than on the right hand side, its almost as if the shoulder is bunched up closer to the spine on the left hand side than on the right and as a result looks like im shrugging a bit on that side.
Whenever i try lift overhead with the left side it feels like its trapezius dominant and that my deltoid isn't contracting optimally or at least not as strongly as my right side.

Now the weird thing is when my arms are overhead like this and i protract my scapula a little on the left side then it seems to look more even only it feels tighter to get my humerus vertically pointing straight up.
Would it be possible that i have a flexibility & muscle balance issues on the left side, maybe a bit of a weak serratus anterior, weak external rotators or tight trapezius ect that would cause this?

Any help or feedback is much appreciated, thanks.