practice, yt tutorials, thinking outside the box, and actually taking time on drawings instead of pumping out [see image above] in like 2 minutes [MY DARK DEMON SHADOW OC NAME: STRONGFANG DO NOT STEAL!111111!!!111111111]
also a good tip is to not apply 16 tons of pressure to your paper when trying to sketch or shade an object [you cannot erase it and the line is thick]
you probably already know this