Trying to define what is meant by "fine style" reminds me of Justice Potter Stewart's attempt to define hard-core pornography. He stated that he could not define it , but that he knew it when he saw it.
Possibly the most artistically rendered portrait of an emperor in my collection is that of Galba on this sestertius: GALBA 68 - 69 A.D. AE Sestertius (28.10 g.) Rome late summer 68 AD RIC 309 IMP SER SVLP GALBA - CAESAR AVG TR P Laureate and draped bust r. Rev. LIBERTAS - PUBLICA Libertas standing l., holding pileus and long scepter; S - C in field The engraver created subtle folds in Galba's neck, furrows in his forehead, as well as high relief in his cheek and chin. While I personally tend not to use the phrase "fine style" due to its inexactness, I will use the phrase "artistically rendered" when an engraver goes beyond the normal stylistic illustration of an emperor's features.