The astronaut floats weightless in his space suit in the dark expanse of space. He holds a camera, poised to take a photograph of the stunning blue and white planet Earth. Surrounding the astronaut is the infinite blackness of the Universe, dotted with the distant twinkle of celestial bodies like stars, asteroids and other planets. To bring the picture to life, why not fill the background with a tapestry of stars and galaxies. For the blue and white Earth, use shades of blue mixed with white to create depth, or a gradient effect with darker hues cloaking the darker parts of the Earth. A reflective glint of light off the astronaut's visor would be a good finishing touch!