Hello, @ollallace! Thanks for the kind words. I’m not sure how helpful my advice will be, but I’ll do my best!
I think one of the easiest ways to simplify an art style is to simplify the shape of whatever it is you’re drawing.
So let’s say I want to draw Prompto (which I often do).
If I’m taking my time with the doodle, I’ll be paying more attention to shaping his face (like his jaw and cheeks), the folds of his clothes, the strands of his hair, etc. My line-art for detailed doodles is thin and sharp because I’m being more precise with my brush strokes.
But if I want to draw a more cartoony Prom (not that my style is anywhere close to realism), my lines are thicker and rounder. Shapes become a lot rounder, too. It’s like generalizing a paragraph into a sentence; you take the most important details and get to the point. It gets easier to do this with time, I think, after you’ve more or less established your art style. There’s still detail here, there’s just not as much. And I tend to exaggerate facial features more in this style. Eyes are bigger, mouths frown more deeply or smile more widely and often hang or twist ways they definitely wouldn’t in real life hahaha
Here’s a side-by-side comparison of my styles even though it’s super tiny thanks to this being a text post:
As for drawing bodies, my quicker doodle style turns limbs into spaghetti noodles. Biceps? Calves? Who needs them! Just slap little curvy cones on that character’s body!
Look at my little frozen noodle boy.
I don’t completely forgo detail in this art style– I still draw seams and I still get carried away with hair sometimes (especially Sora’s omg there’s no way to dumb that stupid hair down).
Your “quick” art style might take some time to develop and chances are you won’t be happy with it at first, but don’t give up! The more you practice, the more you’ll learn about techniques you like and techniques you don’t! Chances are, in time, you won’t even use my advice because you’ve found a different way that works for you! :)
I hope this made sense, and that it helps. Good luck! :)