Drawing more than you need, and then cropping it, usually results in a more natural feeling! It doesn't get constrained by the boundaries of the canvas.
Unfortunately (as far as I know) we will never see full arts unless someone datamines it
Here I've compared when you play at 16:9, 4:3 vs datamined arts
It's sad bc even official artbook won't show the full thing, even though theyre really gorgeous