Here is my girl for you! (Any of her 2 outfits is fine)
And from artist to artist, i think you are more than ready. I started taking comissions when i was 17, you are much younger than that so its deffinetly good. And yeah as others have said, the less you should be doing is offering art for free (either practice, want to draw for fun) not paying people to draw their OCs, the art is pretty much "payment" enough.
Best of luck to you, if you keep like that i can see you working as a illustrator, maybe even extras like doing Vtuber designs and the like (if they are still a thing in the future thats it.)