A large format "Coloring Poster Book". Which is like a coloring book, but it has pull-out pages so you can tape them to your wall when you're through. Another one by Ladybird books, this has a extra-large size pull out poster. It is likely to feature stock-art, but no interior shots are available yet.
Colouring Poster Book-
Publisher: Ladybird
ISBN: 0-7214-3437-1
Date: 1994
Blurb: Sonic the Hedgehog and Ladybird join forced to bring you some fast, furious, frantic and fun-filled radical action!

Summary: A book which is entirely made up of a pull out poster. One side is black and white lineart to colour in of each stage from Sonic 2. On the reverse is a full colour information poster on Sonic, Robotnik and Sonic 2 levels. The art is drawn, over stock. The poster is VERY large. Info by: Ota.
Here is a part of the poster, so you can see the quality of the art. As you can see, it's mostly stock-art, altered a little to create the scenes. Notice that Eggman has been replaced with Robotnik inside the flame thrower machine boss.