Hello, I'll try to write a little tutorial here, or a commentary about how to draw character faces using my style, this will be mostly focuse in the female head (I think it will be useful to point out the differences).
It is important to consider that all of this information is focused in my own drawing style, which is influenced by a wide range of comic styles, in particular my Xeno creatures have bigger and sort of expressive eyes, more related to the cartoon and manga.
We start using the common circle and line guides for drawing faces.
We will draw the fur of the cheeks, this is important because these lines are useful to set differences between one character and another, and it also helps define the general shape of the face.
You can modify the direction and size of the fur to personalize further more the character!
It's important to consider that the ears are located at the head, the point where the ear lobe would be is located right up where the fur cheek is.
Something important here is that the distance between both eyes is generally "another eye" as measure reference. This means, if you want to be certain the eyes are well placed you can draw an imaginary eye between the two eyes and take that as a correct measure.
If you're drawing a female character is important to soften the chin and make the general shape of the face more rounded.
The eyes and eyebrows are the first way to show emotions in characters, it also helps them to make them different from each other by modifying the eye shape, size and the color of the iris.
First, you should draw the hair over the forehead (the fringe?), it's important to identify the point where these hair lines are generated, because from that point is where you'll generate the whole hairstyle.
Second, you can draw the rest of the front hair, here's the important point where you'll define the hairstyle and volume of hair the character will have. In this part I usually draw the front hair as some more hair locks well defined, the rest of the hair up front is usually a set of lines that define the shape and volume.
And finally, you can draw the hair at the back and side of the head, you will usually end up drawing defined set of hair locks at the end of the hair or wavy end sections of hair if that's the case. I usually start drawing the hair locks just beside and behind the neck.
This is the most basic and important to consider I think, with a little modifications and extra line you can draw very quickly the face of Ivory.
The female face is smaller, every faction is soft, it's important to consider the female forehead is more rounded, with no prominent section where the eyebrows are located, this is one of the most important things to consider when drawing a female character head.
I leave this here as example, Kitty from Project Prime, just to show you the use of the same building guides draw with other perspective, you can use the same lines to build faces in every direction.