Ears sit at the edge of the face; the nose is its center. Any ring or stud there lands in the middle of every glance and every photo, right at the height of the cheeks — the zone where width is won and lost. That's why a hoop that looks delicate on one face looks dominant on another: the jewelry is interacting with the geometry around it.
Three variables do all the work. Placement: nostril (off-center, cheek-adjacent) versus septum (centered, under the nose). Shape: stud (a point of light) versus hoop (a drawn curve). And size: a 6mm hoop hugs the nostril and reads almost like a stud, while a 10mm hoop draws a visible circle that the eye adds to your face's width.
Match those three variables to your face shape and the choice mostly makes itself.