(A deer drawn when I was 13)
The best tip I can give you, and to anyone in any age really.. Is just keep drawing! Try to draw at least once a day, even if it’s just a tiny doodle.
If you want to give yourself a little extra boost, study your favorite artists, tutorials, art books.. There’s a lot of stuff on the web! And even more in real life.
Basically: keep at it! Pretty soon you’ll be looking back at your own stuff and notice what’s changed.
Happy improving, Anon!!