When coloring this picture, consider using a mix of warm and cool colors to create an interesting scene. Use bright, warm tones for the little girl's clothing, hair, and skin so that she pops out against the background. For the wall behind her, use dark colors, like blue and green. To depict snow outside, use cool, pale colors such as light blue, pink, and white to make it stand out. For the cookies, use warm colors like tan, yellow, and orange. For Santa's letter, use a mix of deep reds and greens to capture the Christmas spirit. Finally, to really bring the scene to life, use a gold pen to draw stars in the night sky.