Frequently description starts wide then slowly narrows down. In this prompt, start narrow, as tight into an object as you can; then move out, not just on the image but on the crux of the story as well.
My example: The ridged metal round, a green stripe accenting it, was crimped tightly to the multi-flattened sides of the yellow painted wood length, the soft pink and black-stained eraser at one end a contrast to the sharp point of lead at the other. The nearly new pencil lay in crystal sands, the rounded edge of a footprint holding it partially elevated and at an angle just so that it appeared to be an arrow pointing out the glimmering edge of a gold watch's dialed face peaking up where the big toe of a dainty foot had pressed. And Gina would remember that gesture of coincidence as the beginning, the glimmer of melting ice, in a very cold case.