Based on the adult manga by Yamatogawa.

Why don't art schools like semi-realistic styles? My style is nothing like anime, but art schools call it anime and anime "one style." Despite them admitting my foundational skills are perfect, they don't like it.

Because you are in art school to learn the basics, not to get better at your own style because who could properly grade it? “Paint this portrait and I will grade you on the use of light and shadow, not your accuracy of copying the portrait” - you show up with something other than the portrait, you fail because the instructor is using the portrait she knows as a reference to grade your grasp of the elements taught in that class, she doesn’t want to fail you but you’ve stopped her from helping you grow as an artist - for example.
You (or someone) are paying the school to teach you the fundamentals of art.
curves, circles, shadow and light, proper use of whitespace, textures, colours, shades, etc so when you show up to art class with an off tangent project, how is your instructors supposed to track your progress and give you proper criticism if they have no idea what it is you’ve done is accurate to their instructions for the assignment? “It looks good yes but that wasn’t the assignment”.
I heard this all through design school because I wanted to do things my own way. I knew a guy in design school, he drew a wet orange for class.
In pencil, the orange was so detailed it blew everyone away.
Such a simple piece, it looked so real.
This dude took the shadow and light project to the next level.
The water drops had reflections, the dimples had details, the orange had bruises - bruises!!! I mean it was just an orange but wow, it had a story to tell and I wish I were exaggerating.
Wish I could find him online to show you his work.
There’s always that one person who makes you feel like a 5 year old with finger paint.
He could draw Marvel style comics, that was his thing but he always went above and beyond in all of the assignments.
He created crazy pieces and he was fast too.
But he did what he was asked to do by the instructors and nailed every assignment.
You wanted nth degree perspective? He created a promenade with elevated trains and trolleys and cobblestone streets, this kid was bonkers good. I knew a digital painter guy who works for Leapfrog and Crayola as a package designer - holy crap, his concept work is amazing! I met him on Coroflot and he was teaching me how to “futurize” my style since I like to create technical pieces and they were too boxy for the design trends.
Dude made this crazy looking garbage truck with headlights that looked like something out of a futuristic space movie.
I wanted him to redesign one of my 3D vehicle models for an animated short but we lost touch. Anyway, Draw the bowl of fruit, draw the curtains, do the shadow and light, draw the live model, paint the watercolour, do multiple lines of perspective - do the “F” out of them and pass the classes knowing that you’ve gotten your money’s worth.
If indeed your skills are perfect, you need to go to a school which specialises in advanced art or fantastical styles like a digital painting course where those instructors can grade you properly and you can actually grow rather than waste your time creating what you already know.
You may be in the wrong school for you.
If you are not fond of being a traditional artist, then traditional art school isn’t for you.
Maybe classes from Gnomon, Computer Graphics Master Academy, Pencil kings, CG Spectrum, etc would be better for you.
They are all online options in case you can’t go to a school like Ringling College of Art + Design (in Florida) which would love your style or an art school in Sweden (there are a few but I can’t remember the names) where they have some of the cleanest (minimalist) and most awe inspiring freestyle art students in Europe - if they have classes in English that is - the ones in big cities like Stockholm and Gothenburg do. Think about it, if you’re bored you need to be stimulated to get better.
My art gets better every year because I challenge myself.
If I didn’t challenge myself with possible failure I’d be drawing the same old junk I did in design school.