My hair used to be that way, so much so that it couldn't even hold a hair clip, but even then it never looked like a helmet. While it was thin and had no curl to it whatsoever, it still lifted away from the sides of my face and back of my head where it hung down. In other words, dry hair, under normal circumstances, will never stick to your head and look like you're wearing a hat when you aren't.
*raises hand* Guilty blur and squiggler here. The tips are useful, even to a studying hobbyist like myself (AKA: The worst kind of artist.) I have read that doing so is disastrous, but seeing the effects, I can definitely tell you, you've done what my school art teacher and hundreds of tutorials could not do, No more blur for me!
Good God, it's about time somebody said something about the see through hair and airbrush highlights. And though it's not exactly a hair problem, a marker for an amateur is when they draw the side fringe without first drawing the eye that goes under it, and the place where the eye is supposed to be is left with smooth flesh...I see it around quite a bit. Why? Can't they see how wrong it looks?
Well, all those things, like you said, are how beginning artists typically draw. The airbrush highlight is simply easy to do, and that's why they do it. I was guilty of it years ago. I would also leave the eye underneath the hair sometimes, because I'd think "I drew a really awesome eye, and I want people to see that" , so I would leave it visible, even though it looked totally weird. I figured since others did it, I could too. Just the opposite is true for the no eye thing. Beginners will sometimes draw fringe-y hair down in the face of their subject, specifically over an eye, if they can't get the eye they are trying to draw to match the one they've already done. Hope that clears it up Think of the people doing this as toddlers in drawing, they're still taking the first steps towards learning to take in the way the real world looks and how to reflect that in their art.
There is a few valid points here. But also a few things which depends on an artists visualisation.
Like the 2 second panels, Some artists like to show the eye, it's not really a do nor don't, it up to the artist to choose whether or not to show it.
Plus the top 2 panels, depending on how you was showing it, I like to use spiky hair on certain characters. Also, Spiky jagged hair was used alot in the anime YuGiOh, again, it depends on the artists visualisation.