Should I follow a specific drawing way?
Depends. There is not one drawing style to follow. But if a learned technique helps you accomplish your task then, sure why not. That's the point of an education. An education teaches you how to use available tools to solve problems.

Math, Science, History, Literature, Philosophy and Art classes are all there to educate you about what had come before and how people have worked through those problems and come to a solution.

Education in different art styles and techniques is important because that knowledge empowers you by giving you the ability to solve problems you will encounter in your artistic pursuits.

When you are sitting in a class and learning a techique think of it as your are adding to your tool set. The tools are there to help you accomplish your goals.

Your goals can be accomplished by any number of application of techniques, tools and materials.

An education teaches you about the tools available and how others have solved the same, or similar, problems to what you have in front of you.

When making your art you will run into your own problems.

To finish that work of art you will need to come up with a solution.

An education shows you the tools and how to possibly solve your problem.

Your artistic goals are your own.

Your tools are there to serve you.

Not the other way around.