The Wikipedia article on peafowl says “The number of eyespots in the train predicted a male’s mating success,” so maybe the poor bird sometimes dreams of having more normal feather colors.
I used default GIMP-2.9. The colors in the original photograph seemed not very useful, so I made a luminance conversion to black and white, sampled colors from photographs of peacocks with normal feathers, and then applied the colors using several masked layers set to LCH Color blend mode. The Hue layers ranged from 100 (yellow-green for the legs and beak) to 230 (green-blue for the body).
To get the feathers in the black and white conversion to have a dark enough tonality to actually blend with the Color layers to produce something like peacock feather colors, I made a copy of the black and white layer and inverted it, and then did a lot of blending to get the tonality to more or less the right place. Adding actual eyespots is way beyond my painting/recoloring capabilities.