Based on this answer, it is established that each mind perceives Galactus differently.
It seems humans tend to perceive Galactus as a Big Guy who likes the color purple, wearing a bucket with horns on his head.
Let's say an alien had seen Galactus before, and saw a ball of light energy, or a swamp monster, or an angry ghost, or something. If they come to Earth, and see pictures of a Big Guy who likes the color purple, wearing a bucket with horns on his head, I would imagine they might ask "Who's that?", because that is not their Galactus.
Would their perception of Galactus change?
Has there been any instance of someone's perception of Galactus changing?