I always need to work up to the highlights. The first time I put them in they are never bright enough. I know that because humans lost the ability to determine absolute brightness a long time ago. We don’t need it for survival but it would sure be handy when painting. I wish I had eyes like the Mantis Shrimp.
On second thought I have enough trouble choosing and matching colours now, with a Mantis Shrimps colour range and visual capabilities it would be much more difficult.