It’s hard to tell for certain without seeing in person, but it looks like your Right scapula is much closer to the spine than the Left is. Rhomboids and lower Trapezius would be responsible for pulling it close, and Serratus would likely be responsible for pulling the left further away. Also hard to tell is the line of the medial scapular border, which makes a difference in terms of upper or lower rhomboids being responsible for pulling in. And most difficult to tell from the back, is whether your head is forward of your shoulders. It seems to be, and if that’s the case, it’s putting a lot of strain on the Levator Scapulae which attaches to your neck to the upper/inside corner of the Scapula and is very often responsible for the burning sensation you describe.