Generate an illustration using double exposure, merging the standard anatomy of two human kidneys, in a pencil sketch style. In this artwork, the right kidney seamlessly blends with a colorful and realistic illustration of an Amazonian native family standing in front of their stilt house by the Amazon River. Meanwhile, the left kidney merges with a vibrant illustration of a team of nurses traveling on a speedboat in the middle of the Amazon River. This double exposure artwork is placed on aged white paper, integrating with it through colorful brushstrokes and pencil lines.