F0UR is a lonely caretaker robot, holding the only remnant of humanity and must take the fetus to sanctuary while avoiding the military robots, that annihilated everyone.
I like the images, but for your story it feels like it should be more dark and less colorful. You can make it colorful if you make it feel ‘artificial’ and ‘fake.’ However, if you look at Wall-E again and pay attention to the colors of the world and the colors of the ship, that could work. Come up with some color reference that give you a palette for the ‘bad world’ and the ‘good world.’ Think of movies that really make use of color. “What Dreams May Come” really visually separated Heaven and Hell. Look at clips on YouTube.