In the end, we both felt a bit unsatisfied, because the book is trying to do three things -- show samples of Chagall's paintings, deliver a biography, and respond in poetry to the paintings. And what we wanted from a given page often didn't match up with what appeared -- the poem would address different emotional beats, the biography would skip over the questions we asked, the painting wouldn't match the timeline we thought we were on.
Again P and I treated this as a picture book so we could avoid the "poetry" thing, although I thought the poems themselves did a good job in capturing the emotional journeys in Chagall's history. It did feel like a collection of poems to me, although I attempted to conceal this from my son. I liked all the pieces of it, but I'm not sure they cooperated with each other enough.