Oh wow that was a lot to look at.
Sup? I'm Hoshi, also a 16 year old high school student.
First of all, you can't go about hating what you do, you need a positive mindset to improve well. You have to look at every drawing as learning experience, after you finish something, look at it and figure out what you did well and what could be improved on.
One thing I think you could work on is more consistent lighting. As it stands now, I can't really say that I can point out specific light sources. You also in some of the older work have/had some anatomy and proportion issues, so studying up a bit on anatomy may be a good idea as well.
I really dig your creature designs, that's some pretty inventive stuff right there.
was I left behind?
Someone tell me, tell me I survived.
Don't look so surprised that I'm home, but just for tonight.
With rough hands and sore eyes
so don't speak, I am tired.
Let's just live through this lie.