ekphrasis
A clear, intense, self-contained argument or verbal description of an object, especially of an artwork.
countable, uncountable
One [trope] is ekphrasis, the literary description of a work of art, the most famous example of which may be the careful depiction of the shield of Achilles in book 18 of the Iliad.
Where it comes from
From Ancient Greek ἔκφρασις (ékphrasis, “description”), from ἐκφράζω (ekphrázō, “I describe”), from ἐκ (ek, “out, ex-”) + φράζω (phrázō, “I explain, point out”).
Adapted from the Wiktionary entry ekphrasis (CC BY-SA 4.0).