It's a common myth that classical marble statues were pure white and boring. In fact it's modern consensus that they were very often skilfully painted, but the colours were lost to time.
Augustus looking very fine there.
Source (in Spanish): http://rodrigorivas3d.blogspot.com/2014/05/policromia-en-la-antiguedad.html
An Ancient Roman version of this where someone with a pallet of 5 colors tried to spruce up a beautifully detailed statue