You can use a reference( a reference of yourself could work too). A simple google search male or female (side) face portrait could be used and depending on how you want to draw (i.e. realism or in your style) work with what you know.
-Hair line is still hard for me *looks in mirror to check your hair line*
-Eye pupil will usually look more flat
-Nose and ears are about the same length and aligned to each other
-Lips can be drawn normally or how they do anime noses down to their chin, it's morphed into one
-Mouth doesn't past where the eye is align
-Bottom of chin and skin that connects to neck has a gap, seems like it should be behind the eyes(I didn't even know about this, you can cleary see me constantly making this error in my portraits!)
-Analyze the portions and where things are such as the eyebrows, eyes, etc
-I don't have any side shoulder/chest tips because it's something I can't get right.
I'd love to see your portrait drawings if you do draw any!

On this drawing, I do see them ears and noses aligned together
',: ^)