The postage stamp commemorating the 150th anniversary of the Universal Postal Union features a central image of a carrier pigeon, symbolizing historical communication, alongside a traditional postal worker with a mailbag. The background includes a world map highlighting the global impact of the Union. Colors used are: Dark Blue (CMYK 1/99/1/0) for key elements, Light Green (CMYK 50/0/0/0) for the backdrop, and Pale Yellow (CMYK 51/51/0/0) for accents. Highlight colors are blended using a "multiply" mode with adjusted opacity to enhance depth and visual interest.