It was flat.
But it was still a nose.
On a face, make sure your noses are on straight by lining up the tip with your character's temples. This is also handy when placing the mouth, which by magic lines up with the jaw angle.
Below the side profile. as shown in the first head, locate the eyes by drawing a line across from the top of the ear, then you'll be able to create the dip and nose.
RT= My general style
Petite= used only for girls
Minimalist= if my character is further away, or I want to draw more attention to the eyes or mouth
Shadow= I don't use this one a lot, but usually for my androgynous characters.
The straight on noses aren't really unique, but you can add a shadow or change the size to differentiate your character. When your character's are 3/4, as they will be for the most of your manga, or side profile, Then you can add a little more personality.
It's most valuable to practice drawing a 3/4 view nose, because it's used most frequently. All three views are a cinch when you remember the Temple/Jaw rule: Nose ---> Temple, Mouth ---> Jaw.
(I tried to think of some mnemonic, but couldn't. :P )
Noses aren't a highlight, but they're necessary- even Voldemort had a nose.