Shrek is a large green ogre with round, brown eyes. He has two pointy ears and a wide, mischievous smile. His attire of choice is a purple tunic with a brown belt. His arms are crossed in front of him and there is a majestic castle in the background. The sky is a warm, vibrant orange while the ground is a lush, grassy green. To finish the picture, I would suggest shading with different shades of green on the grass and castle, adding in some grey shadows in the sky, and using darker greens for shading in Shrek's tunic. For Shrek himself, I suggest adding some brown to the eyes and ears to add definition, and perhaps brush some brown into the top of his tunic to create a more 3-D effect. Finally, use a few shades of purple for his tunic and a deeper brown for his belt. It should make for a colorful, unique coloring page!