Noses are either side view or front view. I’ve sketched both in this daily sketch:
Some of these ideas come from Chilkat style design, some come from semi-realistic side profiles of faces, others come from box front and house screens.
The bottom nostrils, you can see start with a human-like nose on the lower left, becoming longer in the middle, and finally long enough to become a bird beak.
The amount of detail in filler areas depends on the size of the artwork. If you were making a very large design, it would make sense to put more design inside the nostrils. In that center nose/nostrils that goes clear across the page, I might put more ‘u’ shapes in there, or even little faces. In round nostrils, I could put circular filler designs (including small faces).
Just messing around with different noses and nostrils.
A few more ideas on this Pinterest pin.