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Masterly
Artistic Impressiveness
Use 'masterly' to praise artistic skills that evoke admiration and are strikingly impressive. 
Not for Beginners
'Masterly' implies a high level of ability, well beyond that of a beginner or intermediate practitioner. 
Subtle Mastery
Use 'masterly' when someone's skill may not be flashy, but is powerful due to subtlety and precision. 