Minor-T5 said:
I've gotten that advice from tons of people, but thanks anyway.
I spend my life drawing, so I must say this to you.
A good, and recognizable artstyle is only obtained the moment you study other people's works. As a priority, study your biggest influences and inspirations. Mine are for example Walt Disney, Joe Murray and Craig McCracken. Not only you should study the movements, study their face expressions, their anatomy, and their colour palettes. If you're looking for something photorealistic, study the colours and iluminations of photographies/pictures.
Studying human anatomy is mandatory. Even for cartoons. Why for cartoons? Because to break the rules you need to know them first. Not kidding.
Do what you like the most, and never feel forced to use certain methods to make art look "good" (me, for example, I hate oil pastels). There are plenty of ways to make art, find the one that makes you feel more comfortable and then practice. Eventually, you'll learn some different methods.
My art sucked a lot 3 years ago (an art teacher said that my art was inconsistent, and that my trace was poor and dirty), now, with a lot of practice, I'm proud to show stuff like this:
And that's just the beginning. I still have a lot to learn. Some traces in this picture still look pretty bad.
Study samples, experiment with colours, be creative and never, but never ever, give up. They day you become talented and people ask you "Where did you learn how to draw?" just respond "Nowhere, it was just me, practicing all the time". Have fun!