If you study only one style, or take a class with just one teacher, you will become an imitation of that person. You will also miss many different techniques that may not be a concentration for one individual. Study and review as much as you can. Practice and decide what techniques work best for your style.
For example, one of the latest things I've learned is to shoot lower contrast images and introducing lens flare for effect. Normally, teachers shun lens flare. However, used artistically, it can produce interesting and dreamy images, such as the one included in this post.