1) This book was written by the famous English writer Neil Gaiman.
2) This book was written by famous English writer Neil Gaiman.
3) This book was written by a famous English writer Neil Gaiman.
1) This book was written by Neil Gaiman, the famous English writer.
2) This book was written by Neil Gaiman, famous English writer.
3) This book was written by Neil Gaiman, a famous English writer.
Which sentences sound natural?