This scene is full of tension: a tiger is approaching a boy on a rope swing, ready to pounce. The boy is unaware and looking out into the jungle. Details like the trees, leaves and grass add to the atmosphere of the coloring page.
Coloring this picture could be quite dramatic. To emphasize the danger the boy is in, you could use warm shades of red and orange for the tiger, while keeping cooler shades of blues, greens and browns for the jungle and trees. The protagonist can be highlighted by giving him a bright yellow shirt or making his skin a warm tan tone. You could also add in your own special details, such as a brightly colored bird in the sky, to show the beauty of nature in contrast to the risk posed by the tiger.