Take the course ''Writing with flair '' on udemy.com which is instructed by an experienced editor and writer Shani Raja.
The course is currently deeply discounted and it will cost you only $ 10. The normal price of the course is around $ 270.
The instruction is given through short videos. There's a place for discussion with other students in forum-like environment.
Seems to me, it's great source for learning distinctive and stylish writing.