One of the profs at my previous school has her poetry classes work with an art studio/gallery. They choose an art work, write a poem about it, and the studio/gallery posts these next to the works. They are up on the gallery’s website. Go and read it. Admire the level of writing community college students can do.
I’ve always heard it used as “ekphratic” poetry, when the word is used as an adjective. I think the use of ekphrasis is the noun, and therefore would need no other noun. See http://www.figuresandforms.com/FFblog/blogs/blog1.php/2010/07/18/ekphrasis-ekphratic. I don’t know the origin of the word “ekphrastic” as I can’t find any info on it (but haven’t yet checked the weighty tome of my Oxford Dictionary–too much grading to do today to pull it out!)
P.S. I’ve been lurking lately–not comenting–but have enjoyed a lot of your recent posts.
Elizabeth E, Glad to know you are still around. I’ve been swamped with new preps and haven’t always been writing.
Ekphrastic came into use in the 1990s, I believe. I am not sure why.