I love the artwork, but it can be quite confusing, especially if you haven't read the book - but since there's really no reason to buy this unless you're a pratchett fan (if you're not already, dive in - good books to start with are Wyrd Sisters and Guards! Guards!) there's a pretty slim chance of you not having read the book.
Did anyone else hear about the proposed film version? The american film company wrote back to Pratchett asking if they could remove Death, because "The american public aren't ready for a kind sympathetic character in the Grim Reaper". This got a reply of "have you actually read the book?". Bear in mind that this was less than 2 years before the 2nd Bill&Ted Movie