Spent some time analyzing reference photo to determine landmarks and wanted some feedback. Even in a clear reference like this, I'm having trouble figuring out where the scapulas are, triangular expansion, the teres major muscle, iliac crest, PSIS, Sacrum are. Anything annotated here that is wildly off where it should be? Stepping back, is this a useful thing to do, or do people recommend that you just jump straight into gesture plus landmarks?

I'm having a hard time figuring out whether or not my landmark placements here are correct. I've attached a reference photo, the reference annotated with landmarks, and my attempt at the reference (obviously if the annotation is wrong, then my drawing will be wrong too). I'm focusing on the back mostly here, so really just looking at placement of the acromion process, scapulas, triangular expansion, 7th cervical vertebrae, iliac crest, sacrum (which I think is covered by the model's shorts). Is there any placement here that is incorrect / needs to be shifted?