Rio is a vibrant and bustling city full of life and energy. The city is located in Brazil on the shore of the Rio de Janeiro river which runs through it, creating a unique atmosphere. The skyline is filled with tall buildings made of different materials such as glass and concrete, reflecting the vibrancy of the city in its architecture. It is also full of green space with trees and parks dotting the landscape, providing a tranquil respite from the city. When coloring this beautiful scene, make sure to fill it with warm and lively colors, from bright oranges and reds to deep blues and greens. Use dark shades to highlight the architecture and shimmering water of the Rio de Janeiro river, and combine them with softer hues to reflect the lush greenery of the parks. Finally, bring the whole image to life by adding in some vibrant color accents on the buildings, trees and river.