I would color the page with warm and inviting colors like yellows and oranges, to give the page a sense of safety and comfort. The three bears could be colored in different shades of brown and beige, to give them a feeling of being one with the forest. The house could be colored in shades of pink to signify the little girl who lives there and bright white for the windows and doors, to give the page a cheerful feeling. The sky can be colored in deep blues and purples, to emphasize the mysterious atmosphere of the woods and the night. Finally, I would add lots of green plants, trees and leaves around the house, to make the page look like an actual forest.