Ok, did another one more specific to what you requested, hair and eyes. Didn’t really do any nose stuff, I might hit that later on
The top three drawings indicate the hairline. The first thing you have to figure out about hair is to decide where exactly on the head it is. If you really lightly pencil in the hairline it helps to keep track of that. The left face is looking straight ahead, so the top of the hairline is towards the top of the head, and it’s fairly flat, maybe dipping down a teeny bit. The middle one is looking down, and as a result you can better see the real shape of the hairline on the head… It dips down and the whole hairline is lower on the head. The right-most image has the face looking up, and you can see that the hairline is all but gone. When a character is looking up like this you may see the hair, but probably wouldn’t see too much more than bangs. Depends on the hairstyle.
The next row down i tried to illustrate the idea of having a spot on the head where the hair flows from. These are really simple examples, tho… just a few variations of “Parted at the side”. There are as many hairstyles out there as people. One way to learn how to draw a lot of different hairstyles is to do image searches for studio photos and mugshots. You’ll find lots of examples of both really nice hairstyles and really grungy messed-up hair, and since people tend to look straight at the camera for those, it’s good practice for faces as well. One thing to keep in mind is that hair tends to clump together, so you can look for large shapes in the hair as well as paying attention to the direction it’s flowing. I’m not the greatest at hair, but I’m slowly learning
The bottom stuff is an attempt to do some profile stuff. Honestly, straight-on profiles are not only difficult but also very very rare. for most illustration stuff, unless it’s vital to have a side-view of a face, it tends to look better to use a 3/4 angle. Doing image searches for mugshots can get you lots of profile images as well, which is good practice
I tried to show basically how to make a side-view eye. One really really effective way to indicate the eye is being seen from the side is to put the pupil all the way to one side of the eye and to make it thinner - more like an elipse. This also works well for looking up and down: just put the pupil at the very top or bottom of the eye and flatten it out. I pretty much just do this for front views as well, it just makes it feel a lot more like the character is looking in that direction.
Hope this one is more helpful than the last one. Keep on drawing