This has been a very weird thread to read (I was on vacation for a week, just got back, I might have posted earlier if I had the chance) for various reasons. Mostly that I didn't realize I had left such a sizable impression (or more unflatteringly, psychological footprint) in you with my various pieces of half-art.
I'm not sure if, on the abstract, trying to emulate my stylistics is a worthy endeavor because a) I'm not very accomplished as an artist and 2) they are based on reflex much more than on theory so you should be honing your *own* theories before mirroring someone else's reflexes, I think. This is to say it'd be very much more worth your time to spend the time you're spending on me by just doing life drawing and going through an actual master's artbook and doing all the examples over and over. Trust me, their approach will pan out better in the end. I still can't draw women or mess up on anatomy often and I'm 25 years old. I know 20 year olds that went to some good art classes and followed master guides/workshops that confidently can draw pretty much anything human-emotion related from memory now without making the same stupid mistakes I keep making.
Having said that, the progress of this thread makes me feel it's not a waste, seeing how you've gotten better at what you should have been doing anyway (: fundamentals of construction and consideration of mood) instead of what is merely surface (: throwing straight lines in there somewhere or just putting an electric neon highlight somewhere). This seems to inform my general notion that whenever someone sits down to draw with a high mission, they'll always arrive to certain considerations and approaches that make their art better (and more distinctive) even if the high mission is 'copy someone I think highly of'. That isn't to say that some missions aren't a better than others as far as skillbuilding goes. The last picture of yours for example, seems very NaCl to me, instead of very Helmy. If you consider that a failure, know that I don't
I won't be giving you an edit because that defeats the purpose of the thread, just keep in mind that the highlights on the hair do not obey any theory I've used for shading hair and probably are 'wrong' (as wrong as a stylization can be at least) considering most lightsources. It would be an effect I'd personally underplay. Smaller shine, less bright, more an emotional tool than a rendering artifact.
The facial construction is pleasing, I enjoy her expression also. I think this is the sort of piece that would benefit from having more of a bust instead of 'goes to vague neck then disappears'. This is because her facial emotion right now could be attributed to a lot of things, momentary sadness or something more significant. I think you should use more of her body language and/or props to deliberate a little on why this girl is sad/skeptical. For example here's an old and unfinished piece of mine that if you just crop the head has no emotion whatsoever, but if you consider the whole scene (the woman is about to pierce her own arm on the luminescent wood, blood will flow inside the clear reflective pool below her) the effect is more specific and 'colored' for lack of a better term when discussing something so monochrome.

Finally, if I wanted to upset your concepts of how I draw I probably could. For example here's an unfinished and unpublished work that doesn't obey any of your observations.

What do we do about this? We stop trying to imitate surfaces of some guy and get down to why we want to draw ourselves, probably, right?

Hum, I think I'll finish the piece above now.
P.S. keep in mind that I might appear somewhat negative because I have a lot of problems with receiving complements, even inadvertently. When confronted with that I've had an influence in other people's lives I struggle very much with whether that influence appears to be positive, on my own, not alien, terms. I am still undecided if influencing anyone's art style is a positive one, still. I know that's pretty retarded by a guy that's been giving artistic critique for over 6 years online, but there you go.