However, and please take this with a grain of salt as I am learning about fit more and more myself, I think you could do with more room in all areas of that jacket. The buttoning point seems to pinch and I know you are a very athletic guy, so I am sure it is due to a "gut" or anything but limited room to taper down from the chest. If you had more room in the chest and shoulders, you could taper to the waist for a more flattering look. The bunching on the left shoulder also indicates to me the same problem I have in some of my smaller sized jackets, not enough room for proper drape. I think if you sized up and gave yourself a bit more room in the upper body of your jackets, it would flatter you more.
I am learning this myself. The jacket I am wearing today is a size 42 when I have never worn higher than a 40 or a medium in an off the rack suit or shirt. Would be worth it to see. I think the arm crinkling is maybe due to the fabric or the pose (is it lightweight?) but could also benefit from more room as well.
Overall, nice post, keep it up! Hope this doesn't come off as harsh. I am just starting to come to this kind of realization myself.