I was in a kind of quandary about the bottom two right illustrations, because I like them both for different reasons. I like the silver suited Rockeman and the hot, thermal glass on his helmet and the muted frames on the sides. But the other one has more definition in terms of making Rockeman stand out and since he is the hero, even though the real Rocketman is inside the suit, not the suit itself, still the colors are more comfortable to the eye and more clear.
Now as to the process of actually creating Rocketman, that's another story.