William A. P. Childs is the author of Greek Art and Aesthetics in the Fourth Century B.C.From his Q&A at the Princeton University Press blog:
What is the character of the art of the fourth century?--Marshal Zeringue
On the surface there is little change from the high classical style of the fifth century—the subject of art is primarily religion in the form of votive reliefs and statues dedicated in sanctuaries. The art of vase-painting in Athens undergoes a slow decline in quality with notable exceptions, though it comes to an end as the century closes.
Though the function of art remains the same as previously, the physical appearance changes and changes again. At the end of the fifth century and into the first quarter of the fourth there is a nervous, linear style with strong erotic overtones. After about 370 the preference is for solidity and quiet poses. But what becomes apparent on closer examination is that there are multiple contemporary variations of the dominant stylistic structures. This has led to some difficulty in assigning convincing dates to individual works, though this is exaggerated. It is widely thought that the different stylistic variations are due to individual artists asserting their personal visions and interpretations of the human condition.
The literary sources, almost all of Roman date, do state that the famous artists, sculptors and painters, of the fourth century developed very individual styles that with training could be recognized in the works still extant. Since there are almost no original Greek statues preserved and no original panel paintings, it is difficult to evaluate these claims convincingly. But, since there are quite distinct groups of works that share broad stylistic similarities and these similarities agree to a large extent with the stylistic observations in the literary sources, it is at least possible to suggest that...[read on]