The show had already established how Tendi has green blood earlier in the series after an injury and it would have been an easy to infer detail compared to humans in the show.
Other animated shows like Steven Universe already show how non-pink blush colors can work in animation.
A common beauty hack is to match your lipstick colour to the colour of your nipple, so yeah.
That's extremely cultural, and doesn't even stand up to the a historical test. I doubt it would carry over across planets. (Works great for TV audience though)
