Ronnie Coleman as natural:

His skin looks light there. He probably also used tanning lotions later on. He also looks less primitive facially compared to later years.
Great build for a natural — if that's true.
Compare that to a dark skin:

Meet The World Most Darkest Woman
Nyakim Gatwech, an American model of South Sudanese descent, has caught global attention for her stunning and unconventional beauty. According to several websites, this 27-year-old model, also known as "Queen of the Dark" is worth $4 million for her "beautiful dark skin tone".
https://www.boomplay.com/buzz/2599650