Is it permissible to trace the Quranic script with a pen on transparent paper placed over the pages of the Mushaf, for the purpose of learning the calligraphy of the Holy Quran?

If the aforementioned papers are clean and are placed on the pages of the Mushaf to learn its script, then there is no legal impediment to that, and it does not contradict the veneration of the Noble Mushaf, as long as the Mushaf is not touched without ritual purity.