Practice for Shading Students coloring worksheet. Teaches students the difference in values. Start by having students color in the boxes on the left, making sure that the top box remains white for highlights, and the bottom box is the darkest for shadows. There should be a gradual shift between the darkest and lightest boxes. Once complete, have students color in the sphere, apple, and cone. Ask them to locate where the highlights, midtones, and shadows would be.