It was a fun job (not least because the long-form poem is great). I wrote down how I saw things first, and then sent in some roughs - working with the designers and Christopher to make sure I was heading along the right lines. It was a remarkably painless process - made so easy because Christopher's writing was so exact.
Here are a few of the final illustrations, along with the final cover - put together by Eleanor at Faber. The book comes out on September 5th, but you can preorder it here.
The book itself, which you can buy here.