~FULL VIEW PLEASE~
&& please read. Don't judge and learn.
In regards to proportion, many artists struggle in this area. Not many people know part of the feature of the face relates to other aspects, but they do and here it is for you to learn. If these are unbelievable to you, believe it. Check in the mirror for yourself and you will see the same result.
This tutorial is not realistically the same as compared a real human but the proportional is very similar. The eyes are disfigured but it is the quality seen to be attractive in some anime or manga styles. The proportion is the general rule of what many artists follow. Please take this into account. Edit
: TitleMade while constructively criticizing and praising *spring-sky's Lilo: Pirate of the Flying Ship. I hope this will help you improve! Good luck~