I had a friend who was taking art lessons through Utemy or whatever it's called. Anyways he turned out to be a total sped. He could apparently only draw when being instructed. Attempts to do so when not being instructed looked only slightly better that what Chris Chan can do. With Utemy however he could manage to make really amazing pencil drawn art that was incredibly lifelike and professional. I argued with him constantly that he could do it on his own but he would insist that he needed Utemy to show him how to "draw with his shoulder."
Wha a coincidence I was going to talk about this....
My #1 advice on how to avoid that is this::
You need to know exactly what you want to acomplish. You see actually a lot of art instruction can be divided in two big categories:
Artists that want to mostly Capture life vs Artists mostly draw from imagination.
Yes, all artists use reference, But those two huge branches do exist. Ignoring this will cause people a lot of headaches. Let me explain: A lot of people want to draw from imagination, be it cartoons, or manga, comics etc, but they go with teacher that teaches how to "capture the model" instead and then be confused why their drawings from imgination are shit.
Artists that "capture life" usually aim at having their art in galleries: Think people that just want to copy a nice landscape or draw hyper realistic pencil drawings of a celebrity to share on facebook or a boomer that justs wants to draw their kids.
Take for example this:
100% done in ballpoint pens by a lawyer. It's amazing. But there is a catch: he can only do this by copying a photo. And that's the weakness of these "capture" artist. They are married to their reference. He couldn't draw this girl looking up or down from his mind.
Nothing wrong with that. Those artists were taught things like using grids as if it was a coloring book which are amzing for getting a likelness, but useless if you want, say, to draw manga or cartoons from imagination. Grids lke this:
.
This is in part due to deceptive marketing. There's a lot of scams in art education in places like udemy and youtube... so you will think you will be able to draw like your teacher from memory.... but turns out the course you are in is for copying. but I digress.
Point is if you want to draw manga and anime, and you aren't being taught construction (aka drawing with 3d from imagination), so you can draw your characters in any pose you wan from your mind, they're wasting your time.