Picture is not especially helpful for fit assessment. Do the button up and don't slouch. Unless you are over 6'3 or 250 lbs you can probably find something off the rack that fits better than first few attempts at online MTM. Once you have a shirt that fits great (OTR or after tailoring) you can send that in and hope to get it replicated by MTM. Even that is not a sure thing as I literally gave a great fitting fit to an MTM operation and got crap back.