Look at the photo on a pro quality monitor and you will see that the color saturation is cranked waaay up. They're lovely fish, but I wish folks would post before/after shots of such fish.
even if the color is enhanced how do they get the spotting and lines on the ventrals? kinda reminds me of a red head tapajos
plus not all bolivians even have color to enhance on their fins
and again with that angelic finnage
I have blue eye rainbows that looked "meh" in the barebottom holding tank for about six months, within days of being added to the plant-heavy scape they coloured up immensely.
It's just a factor of age, food and comfort. Provided all these fish will colour up