Flair = style. The way you show your personality when speaking. For example, some people have a very formal way of speaking because they are serious people. Laid-back people tend to speak casually. Dramatic - showing excessive expression. It means that you have to express your personality through the language. Many people with high language abilities sound "flat" when speaking. To be fluent requires that you can adjust your tone to express your personality and feelings. I hope this helps! https://www.italki.com/michelle

In this case using dramatic flair with a language means to use the language confidently or boldly.

I think this means that if you want to communicate as closely as possible to a native speaker, you need to learn not only "what" to say, but also "how" to express your meaning. This skill will include authentic-sounding intonation, with matching gestures, facial expression and body language that will mimic a native speaker. Otherwise, you may have a wide and sophisticated vocabulary with a good mastery of grammatical structures, and use these appropriately according to context, but still sound very "foreign", if your delivery of the language is not mastered. So, you need to "inhabit" the language, much like an actor inhabits her roles.

I think this means speaking or behaving in a way that attracts attention because it is theatrical, flamboyant or stylish.

'artistic use of language' = dramatic flair for language