Works by Jack Vettriano, Scotland's most famous artist have fetched record prices at auction. But his paintings may owe a lot to teach-yourself manuals. Some of his works show strong similarities to an artist's teaching manual, it was reported yesterday. His most famous work, the Singing Butler, was last year sold for almost ?750,000. It was revealed that its characters, and many others, can be found in The Illustrator's Figure Reference Manual, published in 1987.