This happy blue monster is prepared to defend the mysterious thing behind the locked door! With a big grin on his face, he's got a key in his hand and he looks ready for whatever might be inside. To color this page, try using cool colors like blues and greens to bring out the monster and make a warm contrast with the cooler colors that make up the door. To make the monster look even friendlier, add orange or yellow to his fur, as well as a bit of white in the areas with highlights. Finally, add a few lighter colors to the door to give it dimension and make it stand out from the background.