Honestly, I just practice and try out new things. I'm usually playing around with new tools and trying new methods in terms of shading, lighting, effects, etc. I'm honestly still quite a newbie haha. I haven't even been drawing humans that long (I've drawn animals my whole life) and my style remains quite inconsistent. Practice is key, though. If you just keep drawing everyday, whether it be a full piece or simply a doodle, that's one step closer to getting where you want to be. ^^