The level of English used to write the sentence is advanced or proficient. The sentence demonstrates a high level of vocabulary and complex sentence structure, indicating that the writer has a good command of the language. The sentence effectively uses descriptive language and figurative expressions, such as "magic pen," "glimpse into her mental world," "brilliantly conveying," "delicate," "vivid," "self-imposed isolation," and "shine bright." These words and phrases go beyond basic language usage and show a deeper understanding and ability to express nuanced emotions and ideas. Furthermore, the sentence involves the use of compound sentences with multiple clauses, which requires a higher level of grammatical knowledge and writing skills. Overall, the sentence showcases a sophisticated use of language and stylistic choices, suggesting the writer is proficient in English and has the ability to convey complex thoughts and emotions effectively.

Very good. The sentence is grammatically correct. Your question, however, is not. Instead of saying, "Does this sentence grammatically correct?" you should try "Is this sentence grammatically correct" You use "does" with the third person singular subjects only. For example: Does this sentence make sense?

The sentence contains only one verb, "uses", and it is weak. All the action ("gives" and "conveys") of the sentence is takes place in subordinate adjective clauses. To write more effectively, put the force of your sentences into its verb(s). It is not clear which word is modified by the two clauses: "giving us a glimpse..." and "..conveying..." Are they adjective clauses that modify "pen"? Are they adverb clauses that modify "uses"? Are they adjective clauses that modify "Taylor Swift"? Any of those three interpretations would work but you should make the choice for the reader. You should not create ambiguity. Since those three interpretations end up meaning the same thing, this lack of clarity is not too damaging. But the clauses are awkward because those clauses really want to be verbs. The sentence would actually work better without present participles. Why use them at all? If she gives and conveys, why not say so? "Using her magic pen, TS gives us ... and conveys ..." The final clause, "but ... bright", is also problematical. It contains lists and so many conjunctions ("and" .. "and" .. "but") that the reader must work hard to figure out just what is being listed and what are the ideas that are joined by the conjunctions. It would work better broken apart into two or more sentences.