This coloring page depicts an army of small, green aliens invading a city and abducting a giant purple creature known as Gigantika. Behind them is a large spacecraft, suggesting their extraterrestrial origin, and they have a ray gun pointed at the giant and seem to be controlling it. However, Gigantika is desperately trying to break free from their grip.
For this image, I would recommend using bright, popping colors that emulate the intense scene. The aliens could be colored vivid green with purple ray beams emanating from their gun, while Gigantika could be colored in a deep violet or magenta and some gold or yellow to emphasize its struggle against the aliens. For the background, a mixture of blues and grays with a hint of pink or orange could be used to show both the alien spaceship and the cityscape they are attacking.