Merriam Webster: "a literary description of or commentary on a visual work of art."
Wikipedia: "Ekphrasis has been considered generally to be a rhetorical device in which one medium of art tries to relate to another medium by defining and describing its essence and form, and in doing so, relate more directly to the audience, through its illuminative liveliness. A descriptive work of prose or poetry, a film, or even a photograph may thus highlight through its rhetorical vividness what is happening, or what is shown in, say, any of the visual arts, and in doing so, may enhance the original art and so take on a life of its own through its brilliant description."
Poetry Foundation: "An ekphrastic poem is a vivid description of a scene or, more commonly, a work of art. Through the imaginative act of narrating and reflecting on the “action” of a painting or sculpture, the poet may amplify and expand its meaning."
The Ekphrastic Review
Find a writer, artist, or poem, etc. by searching here: